system
A chat on subreddit /r/me_irl
human
There is a big old plug of it in the cervix when pregnant though. Literally “mucous plug”.

And after birth you can have plum size blood clots. It’s reeeeeal nice.
gpt
My favorite (/s) part of delivering my son was when the nurse said to tell her if I had any golfball sized blood clots, then when I did she said that's okay let me know if it becomes baseball sized, then when I did she bumped it up to a softball sized one. Luckily I didn't get that far but I'll always wonder at what point do they actually get concerned