Ok so I was supposed to get my period on the 13th..(My boyfriend & I had sex one the 26th of December) it's now going on the 18th. I'd say a week before I got my period I believe I spotted. About two days ago I had this sharp dull pain in my back & stomach that went to my right leg.. it's been on going now on & off but not as bad as a period cramp.. I'm hoping I'm pregnant but I've taken two test one was taken yesterday but came up negative but still no period. BTW I've had a little nausea.