Sorry for your losses. Has your progesterone ever been checked as the potential cause of these early miscarriages? My progesterone was 8.8 at 10dpo when I went in for my first beta. My Reproductive Endocrinologist put me on progesterone supplements RIGHT away. We already knew from prior rounds of Clomid as well as an IUI cycle that my body just didn't make enough progesterone regardless of how strong and mature of an egg I ovulated.
My new OBGYN is a STRONG supporter of progesterone supplementation even at levels a regular OBGYN wouldn't worry about it. He requested I have a special progesterone blood test done that had to be sent to a special institute in Omaha, Nebraska. Just to make sure the prometrium my RE put me on was working well enough. They took my blood sample during the 6th week of my pregnancy. It takes 7-10 days to get results back, but the second they had the results my OBGYN was calling to say he was switching me to progesterone injections twice a week. My number was only 9.3 at 6 weeks of pregnancy and it should be closer to 25. He says progesterone is important for the whole pregnancy. My RE was going to take me off progesterone next week, but now I won't be stopping it. I will take these injections until my level is sufficient enough to indicate my placenta has officially taken over with progesterone production. Not enough progesterone production can occur throughout the whole pregnancy, not just in the first trimester like a lot of OBGYNs and REs go with. My RE was fine with the 11 he got last time he tested my progesterone, but my OBGYN was not fine with it. His thought is better safe than sorry, even though I haven't had spotting or cramping.
Anyhow, sorry this is lengthy... but I am a strong believer in progesterone support for those who need it. I have PCOS and because of it, I also have luteal phase defect. Most women's progesterone stays up for 14 days after ovulation, which is sufficient enough time for a baby to implant before the uterine lining starts breaking down. Mine would drop off earlier and AF would show up around 10 to 11 days after ovulation. Fertility meds helped extend me to 14 days, but my progesterone was never higher than 13 even in medicated cycles. So luteal phase defect (aka low progesterone because the corpus luteum is failing to make enough progesterone) is a very real thing and leads to recurrent miscarriage in many women.
If you haven't seen a specialist yet, you may want to find one. You'd be surprised at how many regular OBGYNs just aren't very knowledgeable on the importance of progesterone or they think it's an unproven hoax.