I have really irregular periods like I go 6 months without one then get on for 22+ days well I decided on Jan 18, 2014 I would take my sisters extra pack of Tri-Sprintec birth control to stop my period well on Jan 20 it ended my period. Then when I woke up on Jan 23rd I was bleeding again it stopped later that afternoon and started back up on the 24th and I have been on since then and still haven't stopped. I take the pills everyday at the same time and have no missed a pill and I am not sexually active. Need some advice I am planning to see my obgyn tomorrow but not sure If I plan to tell her all this since I took my sisters pills.