4 dpo cramping and sore ?

it started yesterday on my lower right side and the cramping is like period cramps they just come and go .. and my AF is not due till November 29 so i know its not AF coming ... my O day was November 15 and we BD on the 12,13,14 .. my are sensitive and they never get sore not even during my AF is this a sign of pregnancy or an i just going crazy