So my stomach hurts and i can't lay on it without throwing up am i pregnant if i had my period 3 weeks ago i felt like this my last pregnancy?

Possibly: You could be, although this is rather early to have any symptoms. If your period was only 3 weeks ago, and they're usually on a regular 28-day cycle, it is possible that you're about 1 week pregnant. If these symptoms persist, and you miss your next period, then take a pregnancy test. Your symptoms could also indicate an infection, however. It is ideal that you see your doctor today. Best wishes.

Not necessarily: Usually pregnancy doesn't cause abdominal pain or nausea/vomiting this early. If you are worried check a home pregnancy test in the next several days but really you should get the nausea and pain checked out by a physician before that if it persists because you could have something more serious like appendicitis etc