chicken pox

I watch my friends little girl and I had her yesterday, this morning my friend called and told me her little girl has chicken pox, I'm 15 weeks pregnant and terrified. I've never had them and I'm not 100% sure I even had the vaccine. I'm going to call my doctor first thing in the morning but I'm just nervous :/ and can't stop thinking about it. I read online you can get it 2 days before a rash spreads on someone and then it takes about 10 days to show up.