I am in the same situation..... I work in a preschool and there was an outbreak of the chickenpox.... I had the vaccination about 5 years ago as I have never had it - My obs took a blood test and it turns out that I am still not immune to chicken pox and now I have to have a month off work....

My Obs did say though, that it is highly unlikely to pick up rubella (as the vaccination is very effective and the majority of the population has had it) - unlike the chicken pox where the vaccination is not as effective and alot of children have not been immunised...