I was rubbing my very pregnant cats belly when a thick tube like yellowish cream came out of her. ?

I was rubbing my very pregnant cats belly when a thick tube like yellowish cream came out of her. Was that her mucus plug? That was 24 hours ago, and no sign of labor. She hasnt done any nesting, no unusual behavior. If it wasnt her mucus plug is it an infection? Her nipples are large, but theres no milk sac. So I worry if its coming soon is she going to get milk? Do I need to get milk supplement and bottles. I dont know if this is her first litter we found her eating our garbage less then six months ago. I dont know if shes full term cause she made a couple different great escapes out the window before we noticed her belly growing.