I received my FIRST depo shot on November 21, 2013. i have had REGULAR AND ON TIME PERIODS and since that day until now Mar.4, 2014 me and my boyfriend have always have unprotected sex and he ejaculates every time. I was due to get my SECOND shot February 21, 214 and did not go. it is not MARCH and my period didn't come on as it would regularly do in the previous months and I haven't been feeling like myself.. could I be pregnant?