39 with 5 Children, 1 Miscarriage in 2016 & TTC

I have 5 children (6, 18, 19, 20 & 21)....recently married and husband has NO CHILDREN! I found I was pregnant in September 2016 then miscarried (1st miscarriage) on October 15, 2016. Have been trying to conceive ever since and i'm beginning to get a little discouraged. Went to a fertility doctor or told me my eggs are still very good and I had no complications from the miscarriage so there should be no reason why I can't get pregnant again. After hearing that, instead of doing IVF, we decided to keep trying the old fashion way (having sex). Nothing yet! I don't know what to do anymore....feeling frustrated! Any advice??? 😕