The changes in reproductive hormones over the menstrual cycle trigger many physiological and behavioural responses
Below are listed some of these key changes, beginning and ending with menstruation (day 0 / day 28):
- Day 1 – 5: The average period lasts ~ 5 days, during which the body may release prostaglandins (causing cramps)
- Day 6 – 11: Estrogen levels rise during the follicular phase, making a woman feel more confident and flirtatious
- Day 12 – 15: Nearing ovulation, the woman will be most fertile – this is the best (or worst!) time to try for pregnancy
- Day 14 – 15: With ovulation, estrogen levels drop temporarily, which may lead a woman to feel cranky or emotional
- Day 16 – 19: Estrogen and progesterone release prepare for pregnancy and can lead to breast tenderness
- Day 20 – 21: If fertilisation hasn’t occurred by this point, the ovaries will stop producing estrogen and progesterone
- Day 22 – 28: Falling levels of hormones will cause irritability and may lead to craving for sugary foods (beware zits!)
Key Events of the Menstrual Cycle
