I’m just now getting my results back after having this done Dec 19 & Dec 21 🙄 I called the lab company and got these results. They didn’t double? Definitely increased from 8843 to 13768, but didn’t double. Of course, I was about 5.5 weeks at the time. I read if you’re past 4 weeks, it can take four days to double, so this could have been why. I’m now 7.5 weeks, and haven’t had any issues. I go for my first ultrasound next week. Anyone else have hcg levels not double? My samples were taken exactly 48 hrs apart.