Hcg of 82 at 4 weeks 0 days then at 4 weeks 2 days levels where 265, tripling in 48 hours can it be a sign of mulitples?

Probably not . It's possible but using bhcg patterns for that is not reliable. I would just interpret this as a nice normal rising pattern.
Bloodtest not enough. The range of normal HCG levels in pregnancies vary dramatically. Your obgyn can perform an ultrasound in two weeks to establish your due date and pregnancy number.
Possibly. Too early. Hcg levels, that early in pregnancy are pretty unpredictable. As long as you aren't having pain or bleeding, i would wait a week a get an ultrasound.