scared of another miscarriage

Amber
Trying to conceive has been a complete uphill battle. Years upon years of medically ttc, <a href="https://glowing.com/glow-fertility-program">ivf</a> for the last year, my second fet resulted in a mc at 5w last oct, this pregnancy I'm 4w5d and things are not looking good. My second beta showed my hcg was going up as it should but still on the lower scale where they'd like to see it, but my progesterone had dropped by a third even though I'm on progesterone support. 
Today's beta showed that in 48 hours my hcg had only gone from 304 to 409...
One thing being wrong, then things can turn around, but both vital things I can't help but feel I'm just waiting for another mc to start.
I'm feeling a lot of heat in the left side of my uterus, very hot.