I need some reassurance

I thought I was 6 weeks..but my sac was 5w3d. The doctor in ER said I didn't have a fetal pole so I'm gonna miscarry. My levels was 1247.. so I have to retest my levels this week and another ultrasound. I'm trying not to worry I already had 2 other miscarriages. Then in the same breath I say should I be worried and he say no