Sounds about right FJ. My DH's shingles looked like a spider bite, until they started to spread.

I'm assuming you've had the cp previously?
Shingles is a mutation of the CP virus which can often lay dormant in you body for years waiting for the right conditions. Usually low immunity.
It geneerally follows a nerve and your neck is full of them.
Oral Zovirax is usually the treatment but I don't think you can take that when pregnant.
We used to use a spray on dressing (that when it dries is like a plastic covering) at the hospital to stop the air getting at it. Just ask the chemist.

Really hope it's not though. GL finding an answer.