4 miscarriages still waiting for a rainbow

Vo

I feel defeated. I've had 2 missed miscarriages, a blighted ovum and now a chemical pregnancy this month. I've had testing done, everything seems fine. genetic testing on myself, husband and angel baby #2 revealed no chromosome abnormalities. I feel like I'm beating my head against the wall. I do have a beautiful son, who is now 3 but no luck since him. Oh and I'm 37, should I throw in the towel?