Yea baby's won't hear a thing cuz their hearing develop until somewhere around 15 wks. I used to play with bands with my first son all the way up until 8 mos preggers and he turned out just fine! :)
My husband & I were at the Seahawks game when they beat the 49's for the shot at the super bowl. Talk about loud! Your baby will do just fine. Like she said, baby is still really small & very protected by the amniotic fluid.
I went to concerts while pregnant with my boys and their hearing is just fine. Baby is way to small mostly by then.