My periods used to be terribly regular, so I could always figure them out. They started exactly 21 days after the last day of my period. It went that way until last year when I got on birth control. I'm on my 4th different one but all of them have made me have irregular periods. Right now I've been bleeding for 14 of the last 17 days and not lightly either. It sucks big time. Only a 3 days break last week. My periods used to last 6-8 days, now I never know. I feel so weak and tired. Made an appt w/the gyn for next week, but I hope I can make it until then. How can a person have that much tissue/blood inside them I wonder?

So in answer to your question, b/c makes periods irregular for me, so I figure that your body will balance itself out soon and have a cycle every 21-28 days. If not, definitely talk to your gyn doctor.

Anyone else have problems like I'm describing out of curiosity? I'm kinda worried as this is the longest period I've ever had.