Currently going through my third miscarriage

I found out on January 20th that I was pregnant after going through 2 miscarriages and I was sure this was it because I got such a strong positive. I started progesterone the day after I found out and started to go to lab every other day to monitor my hcg quant and right away it wasn't doubling appropriately. My ob told me it looked like it wasn't going to be a viable pregnancy and sure enough I miscarried today. It wasn't much because I was so early in this pregnancy but now it feels like a really heavy period. My ob sent a referral to a fertility doctor for me and my husband so hopefully we get some sort of answer. I'm kind of worried about the cost because it'll be out of pocket but I just want to get to the bottom of this. I was 20 years old when I got pregnant for the first time ever with my son and I was so blissfully unaware that it could be really hard for some women to have a baby. I definitely know what it feels like now though.😢