Beta HCG level more than double

Dee

Hello everyone - Had my FET on 7th Feb on 15th Feb I started bleeding which was way more blood than an implantation bleeding would look like but the good news is that it stopped within 2-3 hrs and there’s no bleeding since. my first beta was due today 21st Feb but my consultant brought it sooner to 18th Feb since there was bleeding. Beta on 18th Feb which was 11days post transfer was 276 IU. I was asked to repeat beta on 21st Feb (14days post transfer) and it came back as 1420 IU...it’s more than 4times the first result. We transferred 3 embryos. Do I have anything to worry about or this is normal to have HCG more than double? Thank you 🙏🏻