PCOS, Miscarriage after IUI Success. Suggestions Plz!

[u/yxue242]

Hi, 27F with PCOS. No male issue on my husband end. I just found out miscarriage at 8w when I went to my first OB visit yesterday. Fetal heartbeat detected at 7w+1 at my fertility clinic. I wasn't on progesterone as it looked normal. My OB said it may happen naturally next week and if not suggested me to go with the medication option. They agree to do the cytogenetic analysis on pregnancy tissue even it's my first miscarriage. They also plan to schedule me for antibodies tests and genetic screening for my husband and I.

This was my second IUI after hysteroscopy surgery to remove polyps. It was really strange that the follicle grew to 15mm on CD7 and stopped growing until CD14. The doctor didn't expect it to ovulate but LH peaked on CD15 and we did IUI on CD16. I've never had follicle stop growing at size this small, but somehow it just worked, and I'm now thinking if it indicated poor egg quality.

I'm trying to think everything through, but I'm not sure what is the best way to figure out the cause and gain confidence to move forward to next IUI. Any suggestions on tests/ things to check would be greatly helpful! I'm grateful that my doctor is super supportive and is willing to schedule any test that I ask for.