DD has 2 blisters that have appeared today,one on her head and one on her body. For the past couple of days she hasnt been herself tried and emotional. I had just put it down to the warm weather but now im thinking it might be the start of chicken pox. Im 27 + 3 and im wondering if i need to do anything? I have had chicken pox when i was little so does that make me immune or do i need to have a blood test to check?