no period

so i take birth control and i haven’t been having my period for the last few months and i don’t know why. 🤷🏼‍♀️ i use condoms every time and my boyfriend and i have checked EVERY time if it somehow could’ve broken and it’s always good. i always have taken my pills except for the 2 times i was late to taking it. i know that there is no chance i could be pregnant at all because i use double protection with caution too. so what could it be??