was due on my period on the 29th december, on that day when i wiped i noticed some very light brown discharge which i usually get towards the end of my period. nothing else happened. my boobs have been sore since the day i have been late.. my nipples are very sensitive.. been having slight lower abdo cramping which are on and off... need to urinate more than usual.. i have taken 2 hpt's which were both in the evening and was negative for both.. Not sure what else it could be.. im not stressed out and my periods are very regular.. i had unprotected sex on the 17th and 18th of december and we have been trying for a few years..