My breasts are have been sore for a few days, and now it seems like I'm starting to have what it seems like is nausea from possible pregnancy. Here's what it's like, I have a queezy feeling in my belly, and then it comes up to my throat, like I have to burp, and then I don't burp & it feels like I'm going to puke, but I don't. Does this sound like a sign of pregnancy?