Why can't I get pregnant? !?!

So here's my story. Back in December my husband and I found out we were pregnant shortly after I had what is called a chemical pregnancy. Doctors told us to wait 2 months and try again . Come March we started again and haven't been able to get pregnant. We both are taking out pills and we live fairly healthy life styles. We workout and eat most of the time healthy. What can we do??? Why hasn't this happened yet??? I'm stuck idk what to do. Please help!!! Just needed to vent and get this off my chest. Any comments advice will help... my husband is going tomorrow to have his sperm count done