Hello, so second week of August I started my period. Nothing unusual. Lasted 5 days which is my normal period length.

However, 4 days after I started bleeding again?! It lasted 3 days. It was heavy day 1, but very light the other 2.

Almost a week and a half since and I am bleeding again? It's light though, but it's there.

I do not think I'm pregnant. Or at least it's very unlikely. I take my birth control every morning! What could it be? Advice?