Nemo has been funny all day and starting having contractions last night. About 10 minutes ago I was brushing her and noticed a funny discharge. I immediately took her to her box and then wiped the discharge away.....the only way I can describe it is like a ball of snot (sorry if that grosses anyone out). It was not clear, kinda of a yellowy color with some blood in it.....could this be her plug? Do cats have plugs? How long will it be now???? Please help.