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Last Menstrual Period

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Last menstrual period
The most common method of calculating your due date is by taking the first day of your last menstrual period (LMP), adding 7 days, and then counting backward 3 months.

Last menstrual period (LMP): The first day of last menstrual period, the date that is used to calculate the 40 weeks of pregnancy and a woman's due date. See Naegele's rule.

Last Menstrual Period: (MM/DD/YYYY format) Average Length of Cycles: (22 to 45) (defaults to 28) Average Luteal Phase Length: (9 to 16) (defaults to 14) Estimated Conception: Estimated Due Date: Estimated Fetal Age:
Must Reads ...

Last Menstrual Period:
January February March April May June July August September October November December
Average Length of Cycles:
(22 to 40) (defaults to 28) ...

Last menstrual period. Refers to date of onset of the last menstrual period.
Left occiput anterior. Describes the position of the fetal occiput as being to the left side of the maternal birth canal (position) and anterior in relation to the mother's pelvis (variety).

LMP - ~ (start date).
Low Responder
Low Responder - a woman who does not produce many follicle with injectable fertility medications.

LMP: ~
MSU: Midstream sample of urine
Multigravida: You have been pregnant before, including miscarriage ...

LMP: ~
MSU: Midstream urine
NAD: No abnormality detected (meaning there is nothing wrong) ...

Week since ~ began Amount of hCG in mIU/ml
5 - 50 (less than 5 means you are not pregnant)
5 ...

First Day of ~: (MM/DD/YYYY format)
Average Length of Cycles: (22 to 45) (defaults to 28)
Average Luteal Phase Length: (9 to 16) (defaults to 14) ...

First Day of ~*
first day of bleeding. required field
Average Length of Cycles
From first day of your period to the first day of your next period. Ranges from: 22 to 44. Default = 28. Optional: Leave 28 if unsure.

Date of your ~ (This helps your provider to find out your due date.)
Health problems, like diabetes, high blood pressure or sexually transmitted infections STIs
Past pregnancies (for example, if you had a preterm birth or miscarriage before)
Past hospital stays ...

When was your ~ or what is your due date?
What are your main symptoms?
How long have you had your symptoms?
Have you had this problem before? If so, do you know what caused the problem at that time? How was it treated?
What activities make your symptoms better or worse?

LMP or LNMP -- ~ or Last Normal Menstrual Period. A shorthand term for the date of the first day of normal menstrual bleeding prior to getting pregnant.
mm -- Millimeters. There are 10 millimeters in a centimeter. There are 25.4 millimeters in an inch.

Week 5 after the ~
4 completed weeks plus 1-7 days, in obstetrical terms
Week 3 after conception
Days 15-21 of embryo development
Length of embryo: 2mm on day 21 (end of week 5) ...

The beginning of ~:
Based on the average menstrual cycle of 28 days, your preceding menstrual period was on: (if this is incorrect, and you know the date feel free to change the date calculated below)
Menstrual period before that: ...

For example: Your ~ began on September 9, 2003. Counting back three calendar months would be June 9, 2003. Adding one year and seven days would bring you to June 16, 2004, as your estimated due date (EDD).

Third trimester of pregnancy - The third trimester of pregnancy lasts from 28 weeks after your ~ (LMP) until the birth, which usually occurs between the 38th and 42nd weeks of pregnancy.

The biggest issue we had was trying to determine when my ~ was. I hemmed and hawed about the dates and finally just picked when I thought I had last had one. Because of the inconsistencies surrounding that, we were never quite sure when my due date was.

This occurs approximately 14 days after the ~. Because menstrual cycles can differ in length this varies from woman to woman. The moment the first successful sperm penetrates the wall of the ovum the chemical composition changes, shutting out all other sperm.

During what is calculated as the first two weeks of pregnancy, a woman is not actually pregnant as the pregnancy term is calculated based on the ~. Successful fertilization of a mature egg by a sperm at the time of ovulation is actually when the pregnancy begins.

In practice, doctors typically express the age of a pregnancy (i.e. an "age" for an embryo) in terms of "menstrual date" based on the first day of a woman's ~, as the woman reports it.

If you have undergone fertility treatment, or are unsure of the date of your ~, you will have your first ultrasound this week. This will be when you find out how many babies you are expecting! ...

At BabyCenter, we count the weeks of pregnancy starting from the first day of your ~ (also called 'FDLMP') because that's the way most doctors do it these days.

To get the most accurate results of the triple screen, the test should be done between 15 and 20 weeks after the first day of your ~.
What is the purpose of the test?

(Remember that your pregnancy is dated from the first day of your ~, which means that in the fourth week of your pregnancy your baby is only two weeks old.) During this time, an amazing journey of growth begins.

During the first trimester of pregnancy, if the dates estimated by ultrasound study differ by more than one week from estimates based on your ~ (even if you are relatively sure of when it occurred), it may be reasonable to use the ultrasound dates.

Pregnancy is calculated from the first day of your ~ic (LMP) cycle. Your 1st and 2nd week of pregnancy in fact consist of the time of your ~, ovulation and fertilization but the actual conception takes place roughly at about the 3rd week.

From the date of the ~, the fetal heart will begin to beat on the 22nd day of development. This means that by the 5th week of pregnancy, the heart is beating. Until week 9, the fetal heart rate will increase 3.3 beats per day.

Strange as it may seem, your doctor or midwife will calculate your due date (and your baby's gestational age) by working back to the first day of your ~.

The number of weeks after the first day of the ~ (LMP). Most obstetricians use this time span to determine an expectant woman's due date, since a typical pregnancy lasts about 38 weeks from conception, and conception usually takes place about two weeks after the LMP.

Although the progress of your pregnancy is measured from the date of your ~, conception actually occurs approximately 2 weeks after the date of your period, which can be confusing.

Ultrasound measurements can be more accurate than estimating the date of your ~ to determine your baby's gestational age.

The medical establishment defines pregnancy as beginning on the first day of your ~, meaning you're two weeks pregnant before you even conceive. By the time you miss a menstrual period, you're actually four weeks pregnant.

Calculation of the EDC or due date is performed by counting forward 280 days (40 weeks) from the first day of the ~. Most women do not actually conceive until about two weeks after the first day of their ~.

It may seem odd but, week one is actually counted as the first week of your ~ before you became pregnant. You're not even pregnant yet! However, the body is working as usual to create the right environment for you to become pregnant, like it does every month.

The fertility calculator takes into consideration the number of days in a woman's menstrual cycle, and the initiation date of the woman's ~. Using a combination of these two factors, it determines the date of ovulation.

You need one piece of information to calculate your baby's estimated due date: the date of the first day of your ~ (also known as your LMP). An average pregnancy lasts 40 weeks from that date, although it's common for babies to arrive any time after the 38th week.

Date of ~ or LMP (this will help to calculate your due date)
Contraceptive history
Family history of major disease or genetic issues
General health
Allergy history (drug or food)
Use of medications and/or herbs
Any history of previous pregnancies or miscarriages ...

A vital piece of information that you provide is the first day of your ~ (LMP). It is this date that determines an expected date of confinement (EDC) or the date you can expect to give birth.

A pregnancy is usually referred to in weeks, starting from the first day of the ~ (LMP). However, as ovulation generally occurs about 2 weeks into the menstrual cycle, the developing foetus is thus 2 weeks younger than the number of weeks a woman is referred to as being pregnant.

Week 12
(counting from first day of ~)
Around 10 Weeks After Conception
Please keep in mind that this information is approximate. Each pregnancy is different and growth rates vary. If you have any questions, please check with your care provider.

Occasionally, the date of your ~ is not sufficient to determine a due date. Ultrasound can provide an accurate (or relatively accurate) gestational age and due date that may be very important if it is necessary to induce labor early or perform a cesarean delivery.

gestational age - The number of weeks pregnant someone is, counted from the first day of the ~ (LMP). If a patient has an LMP of 8 weeks ago, their gestational age would be 8 weeks of gestation (but in reality they have only really been pregnant for 6 weeks).

When was your baby conceived? Enter the date of the first day of your ~ (LMP) and we'll print out a table showing you the probable dates of conception, based upon the average length of your menstrual cycle.
Learn the difference between age since conception, LMP and due dates ...

You can calculate your due date from the date of your ~ using our Due Date Calculator. Pregnancy lasts about 40 weeks (280 days), so count 280 days from the first day of your last period, or count back three months from that day and add seven days, to get your due date.

Pregnancy typically lasts 40 weeks, counting from the first day of your ~. The first trimester lasts 12 weeks, the second from 13 to the end of 27 weeks, and the third from 28 to 40 weeks. Your healthcare provider will refer to your pregnancy by the age of the fetus in weeks.

You may have already estimated your due date from the first day of your your ~ (LMP) - this is even though you don't actually conceive until 14 days after your LMP, or later than this if your cycle is longer than 28 days.

Gestational age - Dating a pregnancy from the first day of the ~; 2 weeks longer than fertilization age. See fertilization age.
Gestational diabetes - Occurrence or worsening of diabetes during pregnancy.
Globulin - Family of proteins from plasma or serum of the blood.

Strange as it may seem, your practitioner calculates your due date (and your baby's gestational age) starting from the first day of your ~.

Menstrual: Pertaining to menstruation (the menses), as in ~ , menstrual cramps , menstrual cycle , and premenstrual syndrome . From the Latin menstrualis, from mensis meaning month.
See the entire definition of Menstrual ...

For the purposes of this guide, we will count Day 1 of your pregnancy as the first day of your ~. Since the average woman's menstrual cycle is 28 days, that means that conception occurs at approximately 14 days.
Therefore, we'll start at Week 3.
Week 3 ...

The due date toward which you have been working is based on pregnancy lasting 40 weeks or 280 days from the date of the ~ (LMP). Ovulation will have taken place roughly 2 weeks after this, so in effect pregnancy is about 38 weeks long.

Full-term-This describes a baby that is born 38-42 weeks after the mother's ~.
Fully Engaged-The baby has dropped in preparation for delivery. Fully engaged means the baby's head is at the bottom of the pelvis. This is also called '0 station.' ...

Gestational Age - Age of the unborn baby counting from the first day of the ~.
Gestational Diabetes - Form of diabetes that can develop during pregnancy.
Glucose - A form of sugar used by the body for energy.

Gestational age: The duration of the pregnancy, measured from the first day of the ~.
Gynecologist: A physician who specializes in the female reproductive system.
Next: H-N ...

They occur in almost one in two pregnancies, and begin soon after you miss your period. In other words, 4 weeks since your ~ (LMP), or when you're 2 weeks pregnant. They stop when you're between 10 and 22 weeks pregnant.

Gestational age: Refers to how far along the fetus is, determined by the beginning of the mother’s ~


There's no way to know for sure exactly when you ovulated and conceived unless you had an assisted conception. As a result, most people, including health professionals, will date your pregnancy based on your LMP (~) instead (NHS 2013a).

Premature infants, known as preemies, come into the world earlier than full-term infants. Prematurity occurs when a pregnancy lasts less than 37 weeks; full-term infants are born 37 to 42 weeks after the mother's ~ (LMP).

In most cases, it starts to shrink about 6 or 7 weeks after the ~ and ceases to function at about 10 weeks. Cytomegalovirus (CMV): a group of viruses that cause enlargement of cells of various organs.

See also: See also: What is the meaning of Menstrual period, Pregnancy, Pregnant, Uterus, Trimester?

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