Even if you're taking birth control pills continuously without a break, breakthrough bleeding can still happen.
Breakthrough bleeding is spotting or light bleeding outside your pill-free week. Birth control pills reduce the buildup of the uterine lining (endometrium), making it thinner. This thinner lining brings blood vessels closer to the surface, allowing blood to escape more easily—much like how thin skin leads to quicker bruising.
Read also: Can it hurt to swallow the pill?
