So I'm 14, And I Started Birth Control In December.

So i'm 14, and I started birth control in December. (About a month ago) Everything was fine, until I got my period. It lasted two weeks. And now every time I'm arroused, I bleed lightly for a short amount of time. Me and my boyfriend have been talking about sex for a few months now, and i'm about ready. I dont want to be bleeding during sex... Will this go away?