I got my period on the first of jan..i should have gotten it around the 6th. Im on no birth control and am quite regular. I always have my period for 8 days and it's heavy for the first 6. On the first it was light and stringy..i've never seen that before. It is still very light and i took a pregnancy test yesterday and it was negative. My boyfriend and i had sex at least 7 times without protection within this and the last period. Could I still be pregnant? What else might it be?