Some opinions on HCG levels needed!

So I went for my first pull at 16 dpo and they were 518 and went again at 18 dpo and they went up to 913, not doubled but did raise. My doctor said they raised which is great as long as I'm not spotting or cramping (which I am not). Anyone experience this level rise and go on to have a healthy pregnancy? I'm anxious right now, one more blood pull today at 20 dpo. Opinions welcome!! 🌈