Fertility Issue

Lindsey
We've been together for almost four years, engaged for 2. Now, married for almost 2 months. && we couldn't be happier. 
I'm 19, he's 22. I'm a CNA, he's a mechanic. We have our own house that we actually own. We have matching Audi A4's. 
We're ready to add another member to our little family. 
We have only recently, since getting married, decided to actually start "trying." However, the whole time we've been together, we've never used any form of birth control, & we have a great sex life. 
I'm worried that one, or both, of us may have fertility (or lack of) issues. 
My AF is normally horrible, I cramp so bad I can't get out of bed sometimes. Recently, past year or so, AF has been very irregular. Some months AF doesn't even show up & I just kind of skip a month. 
Sorry if I talked too much or rambled, but I'm trying to see if anyone else has experienced anything similar to what I've been dealing with!?! 
Is there something wrong with me? Am I infertile?