I've been on the same birth control since August of 2015 and I always have a regular period and I missed 1 before my period on the 6th of this month. I had sex after my period which it ended on the 10th and I had sex on the 12th. And I had sex on the 21st and all of a sudden I had a strange period that started on the 24th and that's 8 days before my period and im still bleeding. I took a pregnancy test the 25th it was negative. This is really not normal for me im worried.