Doctors, Chicken pox and pregnancy contact

[JABB]

Docs, we have a 3 yr old with full blown chicken pox. No worries to us as we have both had it.

The question is, I work in a shop ( Small-ish office area ) and on Wednesday, we have a girl coming in who is 8 months pregnant. She says she has had the pox, but we are unsure if it is ok or not to be in contact. It would be at least me, if not my wife to and her.
It is supposed to be her last day in and there is a lot of ground to cover on handover.

[Lemmonie]

I'm no doctor but I believe the incubation period and infectious period with chicken pox is before the actually spots appear. So if your son is covered in spots you'd be ok.

[JABB]

I was worried I might be carrying the decease, although not affected, and could pass it on