Mucus plug?

[H.Sistine]

My pregnant cat Morchella, had discharge four or five days ago, then it went away, (or she licked it, though it doesn’t seem like she can reach her behind as there is business smeared back there, which I have tried wiping off :\ ) and came back a couple days ago. I’m guessing this would be her mucus plug? Yesterday it was just sitting there, but today it looks like some came out. She’s acting the same, clingy and doesn’t seem to get comfortable for very long. Her belly was also firm for a whole day two days ago then became softer yesterday. Her belly is hard once again today. She meows If I move or talk to her, and usually she’s not a loud cat. I have no idea when she got pregnant, as she is an outside farm cat, and I didn’t notice she was till a week and a half ago. (Because of her long fur)
How Much longer might it be? Keeping her in the house…

 

[H.Sistine]

Here is a picture.

 

[H.Sistine]

I do know what labour looks like but it’s been a while, and Morchella has always been a weird one to figure out…

 

[H.Sistine]

She just used the bathroom and it’s further out.

 

[H.Sistine]

Only a few min later and she is in the litter box again!