Struggling

So my husband and I have been trying to have a baby for a while. We have been married 2 1/2 years and I have had 2 miscarriages during that time. Both miscarriages happened very early on in pregnancy. Both happened when I was 6 weeks along. The second one was really tough. We had found out I was pregnant and wasn't having any kind of bleeding or pain, and I found out when I was 5 weeks. It was so exciting!! I have an appointment right away and everything seemed fine. Because I am overweight, we decided to pay extra close attention to everything. Plus, diabetes is in my family, so that's a big worry. We checked my hcg levels and they were normal. We made an appointment to have an ultrasound when I was 8 weeks 6 days. I went in and still there was no sign of miscarriage. We did the ultrasound and they saw nothing except for the sack. As it turns out, the baby stopped developing 3 weeks prior. We had no idea. I never had a miscarriage and I had to have a D and C. The baby never passed and the D and C took place 6 weeks after it stopped developing. We did the D and C, and the doctor said baby was right there ready to come out. It was successful. The next day I was in excruciating pain. Turns out it was twins and the other passed at home. It was heartbreaking. That was a year ago next month. My husband and I want to try again, but I am terrified that I am going to have another miscarriage. I don't know if I can go through it a third time, but we want a baby so badly. I am communicating with my doctor and we are doing blood work to make sure that I'm ok. I just don't know what to do. I am just so afraid to try again. We really want a baby. It's been so hard these past 2 years. Any suggestions?