Basal Body Temperature (BBT) Tracking: Confirming Ovulation Naturally

How to use a two-decimal thermometer upon waking to identify the post-ovulatory thermal shift.

Published by Period Circle Editorial Team • Reading Time: 7 min read • Public Reference Guide (No Login Required)

The Progesterone Thermal Shift

Progesterone acts on the hypothalamus to elevate waking body temperature by 0.3°F to 0.6°F after ovulation occurs.

Take readings immediately upon waking before sitting up, speaking, or drinking water for consistent chart accuracy.

Browse our complete open guide directory or access the interactive tools directly on the homepage.