Basal body temperature

Progesterone raises resting body temperature by around 0.3°C after ovulation, so a chart can show in retrospect that ovulation occurred. Because the rise happens after the fertile window has closed, charting is poor for timing intercourse.

Also known as: BBT, temperature charting

Last reviewed: September 9, 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.