Anxious I’ll lose this pregnancy

I had a miscarriage in January. It was horrible. I was only about 6 weeks along but had been spotting the entire pregnancy. I am currently 7 weeks pregnant and having major anxiety that I will have another miscarriage. I have had zero spotting. I have had uterine pain and twinges but no cramping. I retook a pregnancy test the other day and flipped out thinking my lines weren’t as dark as they had been 2 weeks before. My initial hcg was 13,000 at 5 weeks 5 days. Never had it rechecked because my doctor was satisfied with that number. My first Ultrasound isn’t for a week and I don’t know if I can’t handle the wait. Anyone else flip out while pregnant after a loss? I have a 17 month old and had a very normal pregnancy with her.