Does it mean im a bad mum?

So, about six and a bit months after my due date it will be my 18th birthday, I have had it planned for a while, I am going for a meal (obviously with my little bean too now) and then going out into town for a few drinks as it is my 18th my family have offered to babysit does me going make me a bad mum already?! I hardly go out its just because it will be my 18th ://