Frustrated!! Difficult getting pregnant.

Ok glow users after a miscarriage/d&c last November 2014, I'm having trouble getting pregnant again. My husband and I took a break from trying, and started again this July and nothing as of today. Just not sure what I'm doing wrong or if I should be put on Fertitly meds or something? I think my eating habits and not working out as much plays a part, as well as stress from work. My doctor seems to think my husband needs checked, but I don't believe it's him. I think she needs to focus on my health concerns first,  because of the history I have have with my miscarriage and low progestrone levels in the past.  Any advise is appreciated. I'm pushing 30 here soon and want so very badly to have a little one. I never thought it would be this difficult to get pregnant. :(