okay, so i am talking to my friend and she says that her tummy feels like it is bruised but it is not. it just hurts as if it were bruised. it has hurt like this about a week or so. she swears up and down she is not pregnant, doesn't work out, doesn't diet, she looks to be in a heathy size. her tummy is hard but not rigid or nothing. she says her pooping habbits are regular and her eating habbits are normal. what could be wrong with her?