HcG didn’t double

I had a 5 day FET on 5/1, my first HcG was 121 on 5/10 and today (5/14) it was only 276.4 I’m trying to not freak out but when I’m told it’s supposed to double every 2-3 days and it barely has after 4 days, I don’t know what to think.

<a href="https://glowing.com/glow-fertility-program">IVF</a>

is hard enough and expensive enough, to only then worry about something I have no control over sucks! Anyone else have the same experience with their HcG?

*UPDATE 3rd HcG today (5/16) was 570.9 much better but still not quite were should be. Going back Monday to repeat again, so they can decide when to do an U/S.....