help! confused!

Has anyone bled for a few weeks straight, got on BC, still bled while on BC, and got pregnant? I'm confused if the symptoms I'm having are pmsing, the birth control or pregnant. I started the birth control on January 2nd to stop the bleeding, doctor said I have prolonged and excessive menstral cycles, if that matters. I'm scared to take a pregnancy test because I'm scared it will be another BFN. But I'm having weird symptoms! Help! Thanks!!!!