hcg tripling/ quadrupling

Alyssa

Hi, I have gotten three HCG tests so far and each time they have either tripled or quadrupled. I am 4 weeks 3 days and my HCG is 633.6 (it was 97.6 Thursday evening) the dr mentioned it can be elevated due to multiples but it also happens in single pregnancies.. does anyone have experience with this?!