Hey there! In the very early weeks they don't even have ears yet. :) I remember going to a concert around 7 weeks with my first and worrying too. The womb and all the fluid muffle outside noise a lot so they barely feel much. If it's just a one-off night out, it's unlikely to harm anything, just maybe left you a bit tired! As long as you're not exposing yourself to constant deafening noise for hours every day, your little bean will be just fine. I found loud places made me nauseous later on so I stuck to quieter things. Don't stress over it, we all do things before we know we're pregnant. Take care