HCG Worries

So I got my first blood draw on Saturday at 3 weeks and my HCG was 11. I got my second draw 3 days later on Tuesday and it was 53. I’m super worried and even though the nurse says I’m still super early, the numbers are normalish but low compared to my last pregnancy, so I asked for a third blood draw because I can’t even be excited about this pregnancy until I can confirm or deny that my number are okay.....has anyone had low initial numbers and had a successful pregnancy?