HELP! How soon after you feel/see kittens in pregnant cats stomache does she have them?

Hi, my cat is a little over one year old. and I recently noticed her getting bigger. I probably would have noticed it sooner but I was working really long hours and went to bed as soon as I got home. So she is really big, belly is very firm and she has been eating ALOT. I have cut down the sizes and increased the feedings. I have not noticed her nesting yet, but she may have during the day. I have been feeling the kittens kicking and moving for almost 2 weeks now, they are moving alot now!! there isnt a time when I lay my hand on her stomach that there isnt movement. and I also started to see the babys move. It probably would have been sooner that the movement could be seen but she is a VERRRRRYYYY fluffy kitty. so my question is does anyone know how close she is to giving birth? I hope I included everything. also I would like to add, that we were intending on getting her spayed within these months but she has snuck outside when my children were playing a couple of times. And I also already have loving homes for them with family/ friends. with an agreement that the kittens must be spayed/ neutred. as I am getting her spayed as soon as the kittens are weaned. Thanks