trying....

I'm 19 trying for my first... I had a miscarriage when I was 16 they put me on BC to stop all the bleeding I was on BC for 2 1/2 years and have been off it for 2 weeks. I'm super nervous that I can't get pregnant because I've been having unprotected sex for almost 3 years now while taking birth control and its never failed.. anyone in the same position?