HCG question! Experienced mommies??

Jenna • Due early February with my rainbow baby ♡

I went in for my first appointment where they did an ultrasound but all they saw was the gestational sac... According to my period I was supposed to be 7.5 weeks but the nurse said that I could have my dates off. They checked my HCG levels and they were 11589 and had me come back 2 days later to check again and they only rose to 12460. I accessed my results online but they haven't called yet because they aren't open on weekends.

So my question is, has anyone had slow rising HCG but ended up having a normal pregnancy? I'm kind of freaking out because everything I've read said this is a sign of miscarriage!