Scared to try again.

I have a 4 year old son (totally normal pregnancy and birth) and have since had 4 consecutive miscarriages, the last one being in March. I waited a cycle and I want to try again, but I'm terrified. I have low progesterone and a couple blood clotting issues, but even with medication I wasn't able to sustain a pregnancy. I'm still waiting on results from genetic testing but I'm getting antsy. I so badly want another baby but I'm terrified to lose another.