I took plan B November 3,2008 after having unprotected sex prior to. My period was due to come November 7,2008. Now i was made aware that by me taking this pill would cause my period to be late. but today is November 23,2008 and no period yet. could i be pregnant or is it because i started working third shift October 29,2008 and body just havent adjusted to that yet and so there for thats why i havent gotten my period yet??? can someone help shed some light on my situation