 [ Symptoms ] i missed my period last month for the first time other than pregnancy what could have caused this  i started birth control three months ago and on my second pack of pills struggled to take them on time and on the third pack ended up switching the time i took the pills at altogether from 700 a m to 1000 p m i still have not bled despite finishing my third pack of pills recently and my family doctor believes that i could possibly be pregnant [ Disease ] sometimes your body will not bleed when you are using the pill so that could be another cause   taking a pregnancy test will help you be more sure