I am not quite sure what mycat is supposed to do when she is in labor?

my cat Kitty, is pregnant! yay for me! (she was prego when i took her from a neighbor that was so mean to her. i went to go and get her fixed and bada boom...... so now she is about due and i just have a couple questions for you. she seems to have had contractions all day. she will put her butt in the air and her chest to the floor and you can see and feel the babies that she has in there when this happens. she also has very plump nipples and is not acting very very affectionate.she will let me rub her belly and then when she has had enough will give me a little playful love bite. but just as i think she is going to go further in her labor she falls asleep. she has found a spot in my closet. she paces especially when she is having a contraction. so what do you think? soon or what? oh and her vagina seems a little more wet and more open or swollen.