i've been on my period for 2 weeks and half i started on September 6th im on birth control i go see my Doctor every 3 months for a shot this is the second time this has happened my doctor said if this happens again he might have to take me off BC whitch i dont want to do because i have my bf and i have sex onece a week and sometimes on the weekends i had called my mom and told her one day my period will go away then a couple hours later it comes back.