Menstruation because that’s when we shed what was made to carry a baby. Ovulation is the bast time to get pregnant and you have a better chance then. And Fertilization is when an egg is given a sperm to soon become a baby
Menstruation is one part of a woman's cycle when the lining of the uterus (endometrium) is shed. This occurs throughout a woman's reproductive life. With each monthly cycle, the endometrium prepares itself to nourish a fetus.