HCG - big jump

Nicole

So I’m reading conflicting things about hcg numbers and possible multiples… I had a single frozen 5-day embryo transferred and Day 9 hcg was 253… 2 days later it was 874. Found a few studies supporting the idea that an increase that significant is likely twins. Anyone with similar experience? My first scan is tomorrow but it’s just to view gestational sac so may not give me answer on how many babes might be in there. Thanks!