i had my menses 15th of December, 2010 and this year it came on 23th of January, 2011 but lasted for only three days. the first day it came very small, very small on the second day and the third day just a spot which i have not experience before. my period always last for five day but these time around three days. worst of all i feel dizzy, headache and sometimes feels like vomiting. am i pregnant. What is happening to me.