What is the Menstrual Cycle ?
Original Sources :
Cleveland Clinic — The Menstrual Cycle
https://my.clevelandclinic.org/health/articles/10132-menstrual-cycleThe Lancet Global Women’s Health — Hormonal regulation and reproductive health
https://www.thelancet.com/journals/lanogw/article/PIIS3050-5038(25)00001-9/fulltextNHS — Periods: fertility in the menstrual cycle
https://www.nhs.uk/conditions/periods/fertility-in-the-menstrual-cycle/StatPearls / NCBI — Physiology, Menstrual Cycle
https://www.ncbi.nlm.nih.gov/books/NBK500020/