I would visit your doctor and ask him. I am fairly sure that its only the first 12 weeks that you have to be careful. I also think it depends if you have had chickenpox yourself. I had chicken pox when I was 23 and came into contact with someone who was 20weeks pregnant. It really panicked me because I thought it would affect her baby, so I checked with my doctor and he said not to worry.
Hope this helps. Please try not to worry.
Hope this helps. Please try not to worry.