I think my adopted cat is pregnant...more inside?

I adopted a stray cat from craigslist about 2 months ago, when we got her she seemed overweight. She has continued to gain weight and is touchy when I try to feel her belly, her nipples are somewhat more pronounced but she is also extremely long haired which makes it difficult to tell. She seems lethargic today, is not eating much and has vomited some undigested food up. I know cats average a 63 day gestational period, but I am not completely convinced she is pregnant. She also has not gone into heat since we have had her. Wish I could afford to take her to the vet, but at the moment we have legal issues which are rapidly draining our bank account.