yes women can spot on their birth control pills depending on their particular dosage etc. if this happens on a regular basis your medical provider may need to make a dosage adjustment. birth control pills offer excellent contraception. you are unlikely to be ovulating the day before your period so pregnancy would be unlikely as well.
i am on birth control but i started spotting a few days before my scheduled period. is this common? . i also had unprotected sex last night (the day before my period is supposed to start) and so far i haven't seen any sign of my period. is there a chance i could be pregnant?