So I started birth control pills Sunday 8/6. my OB told me to start them on the Sunday closest to the start of my period. I started my period Saturday 8/5. The first week of them I was miserable almost the whole time from nausea. I even threw up once. I read that nausea was a common symptom. but pretty much as soon as my period ended I started having brown discharge. is there a reason why? It's been going on for a little over a week now.