pregnancy loss

Hi! I am 25 and have had a total of 7 miscarriages one of which were identical twins that were conceived through IVF in October and I miscarried both of them at 9 weeks. I can never get past 12 weeks with any of my pregnancies. I just dont understand. All of my tests came back normal and so has my husbands. We have been dealing with losses for 5 years now and I still dont have any answers as to why this keeps happening. If anyone has any advice that could help us that would be amazing. I want to have my rainbow baby so bad😢