I have 4 kids and it took two miscarriages mixed in there to get them. I have to have blood work done very early to make sure my body is making enough hormones (pregesterone I think). Have you thought of seeing a perinatologist?
If you have insurance and your obgyn will clasify you as high risk, you shouldn't have a problem getting a consult with one. It doesn't mean you have to see them for the duration of your pregnancy or anything, but it is nice to have one picked out just in case. I had an experience where I had to see one and it was pertinent so I took who the ob sent me too and he was incredibly rude. From now on, because of my age, if I were to have another child I will consult one in the beginning just to make sure it is someone I would want to see.
My first miscarriage was very hard. My second hurt, but I was older and it seemed easier for me to give in to the idea of nature doing what was right for the baby. (I would say God, but I don't want to step on any religous toes) My second we were trying very hard to conceive my 2nd son. I miscarried on labor day and my cycles were not back to normal for 6 months...the first month I had a normal for me cycle I conceived (and we weren't trying because we didn't want a December baby!! Go figure- He turned 7 today btw!:) )
There is no reason you can't conceive after a miscarriage, just don't give up. When you do conceive, demand to see your OB early on...with my first I saw my OB at 5 weeks preg., then with the child I miscarried I saw him at 5 weeks and then miscarried at 7...so with my 2nd son I was in at 5 weeks and having blood work...with #3 and #4 and a new doc (we moved) I had to throw a fit to be seen before 10 weeks.
I would check out a perinatologist and I would also look into different fertility treatments as well, just to occupy your mind while you try and be educated on the different options available in case you need them.
At least it is fun to keep trying :-)
Good luck!