lower hcg/dark pregnancy test lines

So I found out I am pregnant about a week ago. I was supposed to go in for an ultrasound to see if a cyst was causing faint lines on a pregnancy test, but the morning of I got a blazing positive. My first blood draw was 190. My second blood draw was 438, so more than doubled. I feel like those numbers are quite low, but my tests are super dark. I don’t even know how far along I am, but I’m guessing around 5 weeks. Based on my last period I would be six weeks but my cycles are anywhere from 30-33 days, sometimes longer (but typically in that range). I guess what I’m asking is was this anyone else’s experience?