menstrual cycle

anatomy baby basal bleed bleeding blood blue body calendar care cell cells change chart colorful cycle cytoplasmic discovery egg eggs embryo estrogen female fertile fertility fertilization fertilized floral flower flowers follicle follicles gene genetic green health hormone illustration infertile infertility level medical menopause menstrual menstruation ovarian ovary ovulation ovum patient period petal petals phase pink pregnancy pregnant primary procedure red reproduce reproducing reproduction reproductive research sex sperm stimulation temperature test treat treatment uterine white woman