Implanon?

Amber
 I have now been off my implanon for about 4 months, I just had my first period July 26 2014... It was horrible, I've never experienced anything like it before. And I was wondering if I'm even fertile after my first period? Is it possible...and what's the possibility of actually getting pregnant after my first period off the implanon. We've been trying for 3 months & I haven't yet to conceive. Please help, I'm starting to think maybe I just can't conceive... Or maybe I'm just freaking out.