I don't have the Chicken Pox

It's been one thing after another for me. I had my third visit in the last three days to the Children's Afterhours Clinic. We went in because of a rash all over me that wasn't going away. My parents thought it might have been a reaction to the antibiotic (Amoxicillin) which I had to take for my ear infection. Amoxicillin is a Penicillin based antibiotic and my mom is allergic to penicillin. My rash wasn't going away even though we had stopped the antibiotic yesterday (as per the Doctors instructions since my ear infection was better). The Doctor at the Clinic says that I have the Chicken Pox! My parents have their doubts though.
** Update - Dec 25 **
The rash is going away so my parents are pretty sure that it wasn't the Chicken Pox.