Yes, they can look like pimples, at least until they scab. If your doctor is sure this is chickenpox, you shouldn't need an antibacterial antibiotic, besides the one you're already taking against the virus, since the pus is from the virus itself. If it isn't chickenpox, I suppose it could be some other virus. In that case, it is likely to take care of itself.
I'd wait on your doctor's advise, but chickenpox does seem likely, it would explain your fever too, and you should be fine when you recover. Plus, you only get chickenpox once!
Best.
Dr. Rockoff
Jessie