How do I get cum all the way out?

How do you get cum out of your vagina all the way? I let my so do it for the first time and I swear, I think its out and then I move differently and it shoots out. I took a shower and sprayed water up there but i swear it is still coming out.

NO. I AM NOT ASKING IF THIS WILL PREVENT PREGNANCY. I know it wouldn't.

I'm on birth control and have been on birth control so I'm good. He just came soooooooo much and i just feel so uncomfortable right now. It feels like I'm on my period. Do I just have to wait until it my vagina cleans it out itself? Because right now I'm literally wearing a pad.