I hate to be pessimistic, but really keep an eye on her acting possibly lethargic. Make sure she eats and drinks alot of water, and make sure she isn't too hot(feel her ears and paws). My cat, Estrella, was due about due when I noticed her seeming to have slight contractions and she had a tiny bit of blood coming out too. Then, it just stopped. The next day the same thing happened and I started to get worried, but she was still eating and drinking. Then, the next day she stopped eating and drinking and was acting lethargic. Well, I rushed her to the vet and they had to do an immediate c-section and hysterectomy. Turns out she had tried to deliver one of the kittens and it got lodged and died. By the 3rd day it was decomposing!
None of the kittens made it because they were all too far gone, but Estrella did, thank God.
So, just as a warning, keep a close eye on your kitty. She seems so big, maybe she mated for a long period of time and the first kitten is too bog to fit out. Keep your vets # handy. Good luck and keep us all posted on her progress.