Female Hormones & Contraception

One hormonal loop — the hypothalamus → pituitary → ovary axis — runs the whole menstrual cycle: FSH grows a follicle, an LH surge triggers ovulation, and progesterone runs the luteal phase. Every hormonal contraceptive works by feeding hormones back into that loop to shut a step down. Drag the day, switch the method, and watch the curves, the ovary, and the lining change — then see where the clot risk comes from.