I am taking a progestin-only pill. How long will it take for the bleeding to stop. I've been on since Tuesday? I'm getting frustrated.

Varies. The progestin in birth control pills is what provides contraception. The estrogen is added 4 cycle control. Since ur pill doesn't contain estrogen u don't get the cycle control. Some women continue 2 have regular periods in spite of this, some bleed irregularly the whole time they r on progestin only pills, & some become more regular with time. There is no way to predict what any 1 woman will do.