I am so sorry. I had three miscarriages before and between having my children. I understand how sad and frustrating that can be. I too felt like I wouldn't have children or then I thought I would only have my daughter.
Marycain, as always, has very good advice. I would also have them check your Vitamin b12 levels. I have now found out that I have a B12 deficiency and a problem absorbing vitamin b. My current doctors have told me that is a possible explanation for my previous miscarriages and my horrific pregnancies. This can be treated as well.
Good luck to you and don't give up.
"If you think you can, you can. If you think you can't, you're right". - Mary Kay Ash