What should I do if I think my water broke?

I’m 33 weeks pregnant and high risk, I just woke up because I felt a pop or something I thought it was the baby moving but liquid shot out through my underwear down my legs and all over my bed, my underwear are soaked and there’s a large wet spot where I was laying. I got up just thinking my bladder was maybe full or that I had to pee but I can’t get any pee to come out so I laid back down and every time I cough I feel a gush of fluids. I’ve never had this happen in any of my pregnancies what should I do?