Rescued pregnant queen need help

Okay so my boyfriends sister and I rescued a beautiful orange and white cat we left her outside until I realized she was pregnant she it was early on and no one else noticed until 3 weeks ago she is inside now and tonight she lost a little bit of her mucus plug that was around 4 this afternoon she isn't in deep labor yet or lost the rest of it. We don't know exactly how far along she is and she is so restless you can see her stomach contract the kittens seem big however I'm concerned that she should be further along with labor by now any advice helps I've always been very connected with animals and I'm worried my queen isn't comfortable right now

Stage one labor can take a few hours or days.

Thank you for taking care of her! Can you keep her inside until she can be spayed?

How's it going? [emoji]128522[/emoji]