I'm only 4 1/2 weeks pregnant, however I have pretty much known since 3 days after my temp. rise as I have felt lots of nausea (although I have not actually thrown up yet) and fatigue. I have also felt extremely hungry and thirsty. With my first two pregnancies I did not feel any nausea until 6-8 weeks pregnant. Has anyone else experienced this? Am I possibly having twins? Help!!