Temperature Shift
A shift in temperature following ovulation may signal early implantation.
One the temperature shifts upward for approximately 3 days, you can safely assume that ovulation has occurred. The shift should be roughly .4 a degree upward from the day of suspected ovulation.
Your body temperature shifts subtly during your menstrual cycle, rising after your ovulate. If you check your temperature each day, you can track when ovulation has occurred.
Your basal body temperature shifts.
If you are tracking your basal body temperatures you can see where your temperatures shift downwards then suddenly spike upwards. This is also an indication of ovulation.
This is recorded on a special graph that enables you to visualize the different temperature shifts.
It is then recorded on a special graph called temperature chart that enables visualization of different temperature shifts.
This has a high rate of accuracy for women whose cycles are longer than 28 days and who can document their temperature shifts/ovulation.
Another formula for estimating due dates, called Prem's Rule, is for women whose periods are not 28 days in length, but who can track their ovulation by temperature shifts.
Indeed, a temperature shift that lasts twenty-one days can be a fairly reliable indication of pregnancy.
 See also: Pregnant, Pregnancy, Ovulation, Fertility, Cervix
  
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