hi and thanks for the welcome

we are taking her to the vet on tuesday, the reason we think she is pregnant is, her nipples have started to poke out, she has got heavier and much more affectionate, she had a gentleman caller lol awhile back, bless him, he even walked her home what a true gent!! she also went off her food a week or so ago, and now is eating more! I hope she is pregnant, she has such a good nature

what would you say? is she isnt she? what are the absolute certain signs?