How long does it take breakthrough bleeding to stop after missing a birth control pill?

"Forgot bcp" /'s: Bleeding from a missed active oral bcp will not stop on some occasions until the active pills are discontinued for 5 days or so, and a "new" pack is started on day 6. Any drop in estrogen can lead to withdrawal bleeding , and continuation of bcps simply creates a daily rise and fall in estrogen, which causes the bleeding . Stop the active pills now, and resume in 5 days with a new pack.