Definately go! Like everyone said they will be fine! Its hard not to worry though.
I am a music freak and love my concerts! I think I saw 4 or 5 concerts while pg! I was about 6 months when I saw P!nk in the GA area, I needed to pee before she came out but held it cause we had a really good spot! That will probably be the only thing! And make sure you dink lots of water, as it tends to get hot in the Ga areas.

Have fun! x