Can’t anyone give me some help ??

So I been ttc for abut 2 years and a half and I decided to got to the doctor to get a check up they didn’t say anything they didn’t answer any questions but I did tell them my period was not normal I would have two periods in 1 month so they put me on birth control but in this month my period is still coming and going I have really bad Brest pain ever since so I contacted my doctor and she wants me to keep taking the birth control even after I told her about my side affects has this ever happened to anyone of you ladies what should I do I can’t handle this Brest pain it’s awful