... When my doctors prescribed me the pills she told me to start taking it the day of, which happened to be two weeks into my cycle already. I went ahead and started. And now, two weeks into my birth control I'm having my period (the time I usually have it when I wasn't on birth control). It's pretty heavy like my normal periods. I haven't been late or missed any pills. Can I still have unprotected sex now and during the placebo week if I already had my period this month?