Not sure what im going to do!

My sister in laws hen party is in July and all going well I will be around 21 weeks pregnant then. I can manage the meal and cocktail making haha just not drinking. But she has planned for us to go to a nightclub after. Obviously she is not aware I am pregnant yet but I am considering my husband driving down with me and looking after me. It is about 4 hours away from where I live and he is from there so he could walk me back to the hotel so I'm safe. Any opinions or ideas of what I should do? I do not want to miss her hen do. Thanks x