HCG levels

My first blood draw to check my HCG levels @ 4 weeks, was 245. I went back 4 days later and they were 1085.

And today I went AGAIN, and I haven't gotten my results back yet. But I just want some insight, if anyone has any!

Does HCG double by your current level, or by what was drawn first? Like if it's still doubling from 245, I only expect it to be at 1500. But if it's doubling from 1085, then it should be over 2000!

Once I reach over 2000, I can finally get an ultrasound to make sure I have a baby in there ❣️