Question for cat-owning folks...

[arib]

So, my brother Dani called me this weekend, among the things we discussed was that he and his dorm-mates have adopted the neighbor's cat. (It spends most of they day in their yard, and is very friendly towards them and such. They've named her Squishy, for reasons that I don't comprehend.) Among his many questions:

"How do you know if a cat's pregnant?"

I honestly don't know, so I'm punting it out to you.

The only things I could think of were "Well, she'll get bigger around the middle, and will start nesting when kitten-time gets close."

According to Dani she's getting bigger, acting friendlier towards the local humans, and was seen "canoodling with the boy cats."