Ive been on birth control for maybe 2-3 months now, during week 4 i took my patch off as instructed for my menstrual cycle. The following tuesday i re-applied a new patch. Later that night it feel off, and i haven't applied a new patch. Its has now been a week since my patch fell off and im having light bleeding. Could this be because i haven't put on a new patch as so im menstruating again? Or could it be something different? Yes, I've had unprotected sex before and after my patch fell off.