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?
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.