I went to the Robbie concert when I was about 18 weeks and was worried too - but bub was bopping away (good taste in music like her mummy ) the whole time and she is fine. I would be worried about prolonged exposure to something like that but one off situations I think would be ok! There is alot of protection in there with fluid, skin and muscle - although some studies might show differently I guess. Glad bub is fine today!