Please tell me I am not too crazy....

I always worry that something will be wrong with my baby. My oldest had bilateral cleft lip and palate, and I have two daughters after that that don't have anything. I see all these bad conditions that can happen and I worry about "what if something was missed?" I worry to the point where I don't enjoy my pregnancy. I don't think about it some days, but other days when I am on the support group for cleft moms I see children with terrible conditions. This is my last pregnancy, and it is a boy. I am 22.3 weeks. The first three months I feared miscarriage constantly. I had two before. UgH. I feel crazy sometimes.