How long ago was she caught when cats are around 3 weeks pregnant the nipples will start getting bigger and enlarge and over the weeks hair will fall out around her nipples when she hits about 6 weeks you will notice that she will be getting fat and she will get fatter and fatter her behaviour will change also she will be more loving towards you. if you have any other cats she may start being funny with them but its just hormoans. hope your girl is ok and keep us updated.