Gush of fluid, not pregnant, not pee.

Has anyone had this? I’m on my period, day 3. I’m 1000% sure I’m not pregnant. Haven’t had sex in a long time. I woke up, something soaked through my whole pad, underwear, pants and bed. I thought it was blood. Stood up and it gushed out. Went to the bathroom and to my surprise it was blood and 100% was not pee. There was probably half a pint or so of Liquid. It wasn’t discharge. It was completely clear and smelled like nothing. This has never happened before. I can’t go to the doctor for a while. I don’t have insurance and can not afford another bill. Has this happened to anyone?