Birth control prevents pregnancy by preventing the release of an egg from the ovaries. If an egg isn't released, it can't be fertilized. (No egg means no fertilization and no pregnancy.) So technically, birth control makes a woman keep her eggs.

What happens to your eggs when you're on birth control?

If you're on hormonal birth control, you'll need to stop during your egg freezing cycle. The medications used during your egg freezing cycle prompt your ovaries to produce multiple eggs during one menstrual cycle, instead of the one egg typically matured and ovulated.

Do you release eggs on birth control?

People who take oral contraceptives, or birth control pills, generally don't ovulate. During a typical 28-day menstrual cycle, ovulation occurs approximately two weeks before the start of the next period.