I have been feeling dizzy, light headed, and nauseas here and there. I've also been cramping for the last couple of days and just feeling bloated. I've been sleeping a lot as well. I took a pregnancy test 2 days ago and it came out negative. If I was to be pregnant I would be 1-2 weeks along. How soon can you know if you are pregnant by having a blood test? And can this be that im pregnant or something else? please help