My HCG levels went from 209 to 296 in 48 hours. No bleeding or pain am I just a slow riser or am I looking at a possible miscarriage?

A loss more likely. Unless there is a lab mistake or other possible source of error, the rise of your betaHCG is not normal and the probability of an abnormal pregnancy or of an imminent pregnancy loss is unfortunately high. A repeat blood betaHCG should help answer your question.