I had a termination on the 13th nov 2010. They gave me a depo shot that day I didn't go back for the second shot. I started to spot on the 7th mar2011 finished 9th very light. I feel sick tried and don't really feel hungry at all. I had unprotected sex on the 31st 2nd of jan 2011. Could I be pregnant?

Simply put... yes.

If you are not ready to be a parent, get the shot when you are supposed to.