I have been on birth control for almost a year now and I haven't had any problems until now. I'm on Ortho Tri-Cyclen Lo. When I get to the green sugar pills in the pack, my period usually doesn't start until the second or third day which has never been a problem. My period would usually only last for a couple days sometimes three and stop and it was always really light. The past two months my period hasn't started until the fourth or fifth sugar pill day and lasts two to three days into the first week of active pills. Is something strange goin' on or could it just be stress??? %-)