I misplaced a pack of pills so I got a new one and took the ones I had missed, which was three days worth. I'm pretty sure I also started on week two when I was really on week 3, and since then I have been bleeding brown and reddish discharge and or blood. I'm sexually active but we always use condoms which never break and this is the first time I have screwed up like this on pills. Plus, I have not had sex since the day before I misplaced them. Is this bleeding because of my mistake or should I be concerned about pregnancy?