Yesterday I found out 2 of my friends children have it and I spend a huge amount of time with them. According to nhs site etc you need to contact GP esp before 20 weeks as it can cause miscarriage. I called gp today and the receptionist called me back to say he said there is absolutely nothing to worry about! How can he say this he has no idea if I'm immune or not! I don't know what to do now as I'm really worried but I do know their is nothing they can give you for it. I'm 17 weeks so now in fear of miscarriage or baby having problems :(