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If she is not spayed, is over 6 months old and she goes outside, and it is spring, she is most likely pregnant. Cats start to cycle in early spring and go into heat until they get pregnant.
Her nipples may not change much, but if you squeeze a nipple and milk comes out, she is probably pregnant, and probably going to have kittens within a week.
It is possible this is a false pregnancy, but if her belly is large and she is eating more, she is probably pregnant. The only way to tell for certain would be an xray, which might be a good idea because then you would know how many kittens to expect.
Let me know if this helps and what other questions I can answer.
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