Hi. I'm a little worried about my period. I had the first day of my last menstruation last Dec.28, 2016 and I had sex on that day. It was the only sex I had before my next period. I was expecting that my next period would be on Jan. 25,2017, but it didn't come. I'm one week late already. However, i've been experiencing cramps like the one you feel during your period . Is it possible that I'm pregnant?