Second hand infertility

Hi, I came across your podcast about implantation issues.
I went thru infertility issues for 4 years (Ivf wasn’t covered) 19iuis- I had a miscarriage in the 2nd trimester- 3 chemical pregnancies and 2 miscarriages ending before 9 weeks we did Ivf- my daughter was the only normal embryo – had one transfer and got pregnant and had a healthy pregnancy.
I went back for retrieval and got 19 normal embryos – first round back had an ectopic 2nd round had a chemical and I’m on my 3rd round now- my linning always takes forever to thicken but finally after a month gets to 10/11- this last transfer my doctor has put me under to get to my uterus because the other 2 times were difficult to reach my uterus due to being tilted and scar tissue from C-section. I’m on day 7 post transfer and have a super light positve which I’m guessing will result in another chemical – to say I’m heart broken is an understantment- all 3 of these transfers have been boys- is it possible the boy embryos could be an issue? Could my uterus be the issue? I’m not sure my question- what should I ask my doctor at this point? I’m 38 will be 39 in feb- I have another boy left and 13 girls – help me 🙁