What Are Progestin-Only Birth Control Pills? The mini-pill, orprogestin-only pills (POPs), can prevent pregnancy by suppressing ovulation, although the rate at which ovulation is suppressed can vary by individual.8They work by thickening cervical mucus to prevent sperm penetration, lowering mid-cy...
There are different types of combination birth control pills that contain estrogen and progestin that are referred to as monophasic, biphasic, or triphasic. Monophasic birth control pills deliver the same amount of estrogen and progestin every day. Biphasic birth control pills deliver the same amount ...