I'm on the pill. June 3 I started to get brown/black blood. June 16 I started my period. Still getting the brown/black blood while on my period! It's going on 3 weeks, when will it stop?!

A bit unpredictable. If all of this has happened while you are on the same pack of pills, it will probably straighten out once you get started on your next pack. If this has been going on through 2 different packs, you may not see it clear until your next pack. Talk to your doctor if it still continues then.