Yes apparently so! Lots of women do, some don't even realise they have done it.
But don't panic, the midwife won't even mention it. They just throw tissues over it, pick it up and toss it away. If you haven't noticed or if you do and don't say anything, they don't mention it.
There's a baby's head squeezing down a pretty narrow area so anything that is already in that area is coming out lol xx