Why did this have to happen now?!

We go away tomorrow for a long weekend for our first ever family holiday. We have a 20 month old and a 13 week old and this morning I've woken up with my first period since having my second baby. Like why? Why now when we go away tomorrow. I'm not going to be able to take my baby swimming for thr first time I'm not going to be able to enjoy the private hot tub, we chose our accommodation based on that feature. I'm really annoyed and feel like I'm.not going to enjoy myself anymore that I feel like I don't want to go anymore. My periods weren't bad before having babies but things change and I dont know how this is going to be, how long/heavy/cramps or how I'm going to feel emotionally. Ita just ruined my whole mood and now I'm not excited anymore. It's also my partners birthday too so I've got to be in a good mood I cant let my period spoilt it can i. I'm just disappointed like it could've waited till monday at least.