HCG levels

I’m a nervous wreck. I have a risk of ectopic pregnancy so I had to have HCG levels measured. They were taken Monday and today. Monday I was optimistic as they were 6028. Today I’m worried though as I was under the impression they should double. Mine only went up about 400. Anyone else seen this and everything was ok? Picture of the two tests to show my numbers compared to the ranges.

Let me add that

still within range. I’m just worried bc it didn’t go up very much at all 🙁 (though the more I read it seems that HCG levels aren’t the thing to rely on once you a- hit 6-8 weeks and/or are above 6000, which I’m both)…. Guess I’ll just have to wait patiently for the ultrasound on 1/6 & pray for the best.