For the last 3-4 months, I've had bleeding that lasts from 3-4 weeks, sometimes even longer. It will stop for about a week or two then come back. I recently went to the doctor for my yearly exam, explained this to her and she feels that what I have is PCOS. So, she put me on birth control. In the past, I've been on birth control due to my irregular periods. Currently, I've been bleeding for 5 weeks and I've been on the BCP Trinessa for a week and 2 days.