Ovulation makes you hotter! Just after your ovary releases an egg, your basal body temperature rises. You won’t feel this, because the rise is small, but you can see the change if you use a basal body thermometer or track with Teena.
Basal body temperature (BBT) is your temperature when you wake up in the morning. It is also known as resting temperature because it is your body’s temperature after three or more hours of sleep, before you check your phone, sit up, or use the bathroom.
Your BBT then stays high until your period starts. BBT is directly linked to the hormone progesterone. Progesterone is in the body after ovulation. When progesterone is present, your temperature rises; and when progesterone levels fall, your temperature goes down. Your period follows ovulation and will usually start 12 -16 days later.
BBT can be used as a tool to know when you have ovulated. It can also predict the arrival of your next period. Tracking your BBT by taking your temperature each morning when you wake up is a great way to get to know your cycles. It is the most accurate way of knowing when to expect your period.
Source
Grimes DA, Gallo MF, Halpern V, Nanda K, Schulz KF, Lopez LM (2004). "Family planning with methods based on fertility awareness | Cochrane". Cochrane Database of Systematic Reviews (4): CD004860. doi:10.1002/14651858.CD004860.pub2. PMC 8855505. PMID 15495128.
