How do you know if you cum/finish?

Idk what to call it for a girl. My friend told me it's called squirting lol but I don't like that. But yeah how do you know if you do? And what does it feel like. I think I have just recently for the first time with my boyfriend. Also think I orgasmed for the first time. And the liquid that might come out as a result of the "squirting" is it a thin liquid Does it have a color. He insisted the wet spot on our bed wasn't him.. So was it me 😅