BBT During Pregnancy


Dear Midwife,
Does the BBT ultimately stay high(ish) after conception, or can it dip a little (to 35.5'C) ?

I can't seem to find any concrete information about this on the internet.

I've heard that HcG can take a few weeks to elevate, is it true also with BBT?


L :)


Most women's BBT's have some natural variation from day to day. But classically, the average baseline rises about one degree Fahrenheit after ovulation, and does not return to the original baseline until just before menstruation. As long as your BBT is not going back to what it was before ovulation and staying there, it's possible that you are pregnant.

--Cynthia, CNM. PhD.

Cynthia Flynn

Cynthia Flynn, CNM. PhD, is the General Director of the Family Health and Birth Center which provides prenatal, birth, postnatal, gynecological and primary health care to underserved women and their families in Washington, D.C. Recently Cynthia served as Associate Professor of Nursing at Seattle University. There she not only taught, but remained in full scope clinical midwifery practice at Valley Medical Center where she cared for pregnant and birthing women, and practices well-woman gynecology, family planning, and treatment of sexually transmitted diseases.

Cynthia founded Columbia Women's Clinic and Birth Center, where she took care of pregnant women and infants up to two weeks of age and attended both birth center and hospital births. Before Cynthia earned her CNM, she worked as a registered nurse in labor and delivery and postpartum and is a certified Doula and Doula trainer.