Need help and advice!

I have been pregnant and had 9 miscarriages. Different fathers with some. I have been tested for everything, been to specialists. None of them can figure out why I can't carry. The fetus just stops growing at 5 weeks, never develops a heartbeat, and eventually I miscarry. No doctors have been able to figure out what's going on. Any help or advice? My husband and I just want children so bad! But I'm honestly scared to even try again... It hurts too bad physically and emotionally. Any opinions?