For some women, charting their cycle and tracking their temperature changes is only something they start doing when they want to get pregnant, and as soon as they're pregnant, they stop temping because...well...they're pregnant and they don't need to.
While it's true that there is no need to track ovulation anymore, since your body clearly won't be ovulating for at least nine months, it can still be incredibly helpful and even reassuring to continue taking your temperature each morning. Here's why:
What they don't know is that temperatures that consistently remain above their pre-ovulatory cover line in the first trimester is one way to see if the embryo is implanting properly instead of heading for an early miscarriage.
Just as temperatures above your coverline can indicate pregnancy, temperatures that fall below your coverline after a positive test can indicate miscarriage. Consistent temperatures below your chart's coverline after a positive pregnancy test can (and usually do) mean a miscarriage is on the way.
What does your temperature have to do with staying pregnant? It's all in your progesterone levels. The purpose of progesterone is in the name: (pro) + (gestation) = a hormone that is needed to support pregnancy. If your progesterone levels fall, your temperatures correspondingly fall, and your body will not continue to sustain the pregnancy with the too-low levels of progesterone.
What this means for you, dear reader, is that if you find yourself pregnant, do yourself a favor and keep taking your temperature every morning. A consistently high temperature can be incredibly reassuring in the early days of pregnancy. If your temperature drops one day but is high the next, that is okay. Keep an eye out for temperatures that are below your coverline for two or more days in a row. Watch out for any spotting or cramping* in conjunction with your lower temperatures, and see a doctor if you have excessive bleeding or pain.
HOW LONG AFTER MY POSITIVE PREGNANCY TEST SHOULD I CONTINUE TO TAKE MY TEMPERATURE?
If you do decide to take your temperature every day while you are pregnant, please share your chart with me! There is very little research on BBTs throughout the course of pregnancy, and I'd love to see a pregnancy that is entirely charted with BBT.
Amazing what a thermometer can tell us about our bodies, isn't it? Now start (and keep) charting!
*Spotting/cramping is not always a sign of miscarriage in early pregnancy. See your primary care doctor or midwife with any questions about your pregnancy.