Am I pregnant?

Well, I had my period last july 9 and it ended on july 14 and then my boyfriend and I had unprotected sex on 17th he shot it inside, after 2 weeks I took test and negative but I can feel back aches and tummy pain also fatigue and my sense of smell became strong also my lowerback easily gets numb,feeling more tired and emotional than before. What does it mean? Help :(