Men and women both produce a fluid on orgasm. In men this fluid is filled with sperm and calle semen. We have the same fluid (minus the semen) Just like men some of us can squirt. Some women can only experience a "flooding" Its common to be unsure about these things. Guys are lucky, they seem to never have a problem getting either fluid to come out.
Still, if its coming out "a lot" and you've never done it before, I'd stay in the shower until you know its one and not the other. Lots of people confuse squirting for peeing.
Which is okay in some situations. Just not all of them. Some guys can be edgy about this.