Chicken pox

My baby took his chicken pox vaccine n MMR as well on 9th July.. the nurse told me that it would take 5 to 12 days for him to develop a fever.. so it has been 10 days.. his temperature is still within range..around 36 to 37°C.. but today i saw 4 dots that look like rashes.. but what i am worried is he getting chicken pox???#advicepls