First congrats on ur unexpected baby sorry ur IUD failed it was probably not placed properly and the way ur numbers are it sounds like u are having a very healthy pregnancy!
825 at 18 dpo and 2271 exactly 48 hrs later at 20 dpo - I got pregnant with an IUD and have a 26 day cycle so not sure if either could effect the hcg levels. Also, this is my first, so still new to all this and sorta in shock about the whole situation. Wasn't expecting but doctor insists it's pregnancy.