is something wrong or am i just paranoid??

okay so i’m 15 (almost 16, yay!!) and i’ve been on birth control for over a year now. i’m not a virgin (lol sorry) and i haven’t had sex in over 2 months. i just got off my period last week and it came back again sunday evening. i think it’s spotting, but i don’t know what caused it. it’s been 3 days now and i’m STILL BLEEDING. i probably sound really stupid, but i’m so lost and confused. i tried talking to my mother ab it but she said it was nothing and just that 2 eggs probably just decided to pop out n say hello but i don’t know. it’s probably nothing like she said, but this has never happened before to me. is it the pill? is it me? i don’t know anymore. i’ve been panicking ab it and my boyfriend has been concerned bc it’s ruining my will to anything affectionate. someone please help me!!!