My last period was Aug 17th, and after that was when me and my bf stopped using protection. AF was suppose to show Sep 14th, its now Sep 21st. I took a test yesterday those cheap ones at walmart but it was negative, i havent had my usual periods symtoms i do before i get my period but my boobs are really sensitive esp my nipples, and ive been really tired lately any one else on the same boat? When should i retest again?