See a fertility Specialist or not?!

Steph
I have been trying for baby 2 for almost 2 years now coming this october..my first child we had within a month of trying and delivered her naturally in 2010. We waited 2 years before trying but I never went back on my birth control. We have been having unprotected sex since October of 2013 and I have had several false positives and 3 early term miscarriages due to sicknesses and infections...should we keep trying or look into other options?! We are firm believers that if God wants us to have another child, he will...but she just started Kindergarten and I will be 30 in 3 months and thought I would be done having kids by now...any suggestions are appreciated!