Low progesterone 4 weeks and 6 days

Pretty bummed out today and don’t really know how to feel about it so if anyone can share their experiences it would be helpful.

I’m currently pregnant and almost 5 weeks after first IUI and a year and a half of trying. Went for my first HCG test three days ago and it was 127 and second HCG went up to 427 which nurse told me is good however my progesterone level was low at 8. She prescribed me endometrine 100mg suppositories for night time.

Everywhere I’m reading it states low progesterone levels means high risk of miscarriage and I read one Harvard study plus multiple forums where taking progesterone supplements didn’t help. So now I’m just upset because what am I supposed to do just carry on I’m so scared now I’m gonna miscarry. I know miscarriages happen often and sometimes you can’t do anything about it it’s just a huge bummer about my progesterone level. I feel like there’s always another obstacle .

Anyone on the same boat or have experience w this?