I got my period nov 17 and it ended the 21 of nov. got a possitive on a pregnacy test how. many weeks am i.?

Either 2 or 6 weeks: This period is not your true period because you are already pregnant. Possibly you conceived about 2 wks ago or so. Is this period lighter than usual? Assuming your periods are regularly 28 days, counting back to your last period would be 4 wks and you likely ovulated/conceieved 2 wks before that, thus 6 wks. These are just guesses. Consult doc for thorough eval to find out. Good luck.