With child(ren)?

So I noticed that our cat Helicopter is looking chubby and fear that she may have gotten "in the family way" before we adopted her 4 weeks ago. She will be visiting the vet on Thursday and I am hoping she is just getting fat and not about to have kittens. I have never had a cat have kittens, and it is one experience I would like to avoid. I guess we will find out on Thursday :)