Pregnant cat!!! HELP!?

Well my last question was just deleted for some reason so let me rephrase this. My cat went into labor at 3 in the morning, and it is almost 12 in the afternoon now. She's not in distress, the babies are still kicking, and I know she's still in labor because of the heavy breathing and such. She had contractions at the start of labor but only delivered a placenta, and she hasn't had contractions since. I need some advice on what to do! Is this normal for some cats, or should we take her to the vet soon?