Hello. I am 15 and I currently switched birth control pills from tri cyclen lo to minestrin. I started the pills The Sunday after my period and I had unprotected sex on the Friday. Although I ve heard you must use precautions for awhile when Switching my doctor said I did not need to. Today I had light cramps And then brown discharge . I read in my birth control pack This can happen when switching but I am very worried about pregnancy..help!