HCG way more than doubled! Twins??

I had my first HCG draw was 240 at 4 weeks on the dot. This was taken at 3PM. At 4 weeks 4 days at 9AM my HCG way more than doubled at 1900. Over a 600% increase in 90 hours.

Anyone have big HCG increases and have twins? They do run in my family! This is baby #4.