You might not get one, or you might not see it anyway.

Sometimes it comes out when you water breaks, and it all mixed up with amniotic fluid etc- so you'd probably not notice it. Some women loose it weeks before birth, some just before, some actually during birth, and some never know- I never saw anything with my first. My waters broke unexpectedly at 36 weeks, and I for a while I didn't even realise that's what happened- it was just a trickle at first, and I thought I had become incontinent from not taking my pelvic floor excersizes seriously enough !!!!!
I worried for a couple of hours about whether doing them very seriously from then on would help, or whether I was too late, and i'd be inco9ntinent for the rest of my life- and how i'd hide this from everyone- before it occured to me that I actually didn't have a full bladder at all, and the suspicion finally set in.
It was when I was on my hands and kness feeling under the bed for where I knew I had nudged my address book with the hospital's number that I got a proper gush of fluid.

It's different for everyone.

It won't be long now....