I'm late.

Sarah
My fiancé and I had sex during my big-O week and my period was suppose to come the 11th. My last period was 11-12 and I am now two weeks late this month. I've having to pee every hour and when I go hardly any pee comes out (I know that I don't have a uti) I've been more tired than usual and I feel like I need a nap half way through my day, I've been getting sick if I'm not constantly munching on something, and the past few days my boobs have been really sore to the point where I couldn't wear a padded bra. I took two of the clear blue digital test one the day after my missed period and the other a couple of days ago both came back negative. Is it still possible that I am pregnant? I've never missed a period. I've had light periods and even a few days early or a few days late but never weeks. Thanks in advance for any comments you may have.