Vaginal prolapse during pregnancy ?!

Has anyone ever had this?? I've had that feeling that something is falling out of my vagina for a few weeks now. I had tiny pieces of my mucus plug come out (which I know isnt a huge deal right now), but it made me want to look up there & see. So I sat myself on the floor next to my floor mirror to take a look inside my lady area (real cute) & my vagina looks SO different. It looks like my cervix is RIGHT THERE at the opening! Is that prolapse?? Is that normal?? I've never seen that before! This is my 3rd baby. I have an appt on Tuesday so I'll definitely be bringing it up. But does anyone have experience with vaginal prolapse during pregnancy??