Why does te contraptivepill have eostrgen in it?

The contraceptive pill often contains estrogen to help regulate the menstrual cycle and prevent ovulation. Estrogen works in combination with progestin (a synthetic form of progesterone) to inhibit ovulation, thicken cervical mucus, and thin the uterine lining, making it less suitable for implantation. This combination enhances the pill's effectiveness in preventing pregnancy and can also help reduce menstrual symptoms for some users.