Hcg level

Ashley • Miscarriage 2/2018* Rainbow baby due 9/2019🌈❤️🥰

So if December 28th I took my first hcg level testing and it was 231 what would it be tomorrow Jan 7th if it doubles like it’s suppose to? Just an estimate because I was suppose to have my first ultrasound Jan 25 but my doc told me he figured up his calculations and I could come on in and get my first ultrasound tomorrow but I feel like it is to early and want see anything.