Sigh.... my heart breaks every time I read threads like this.

First, its already been pointed out if you cannot afford a spay, how on Earth are you going to afford vetinary care for her if complications arise? How are you going to afford vet care for 4,5,6 babies?

I volunteer for an animal rescue and we turn away dozens of cats a DAY. The cat population is explosive, and you just willingly and selfishly added to it. Our rescue's director just resigned because she felt too guilty for turning those dozens of cats away daily... she feels like their blood is on her hands because she knows that by turning them away, they'll either be euthanized in an overpopulated Humane Society or SPCA, or set free into the world to become road kill, prey, or victim to disease.

I sincerely hope nothing happens to your kitty during this pregnancy. But if something happened last time, don't be niave and not expect life-threatening issues again this time.

Spay her. There are so many low-cost clinics around today. Many are even FREE. Place a few phone calls, do some legwork, and get her spayed.