Bachelorette party

I have plans to attend a bachelorette party when I'm 29 weeks pregnant in a city that's about 5 hours away. We will leave after work on a Friday and come home Sunday. We have plans to go out to the bar on Saturday night for the big night out. I am a little apprehensive to attend, as is my husband. I haven't had problems with preterm labor or anything like that... It just makes me nervous to be that far away from home, in case something happens. And not to mention, staying out late and having to catch up on sleep! This person is my childhood best friend. Could you ladies give me a little reassurance that this will be completely fine and I'm not being selfish for attending?