possibly??

i've never ever ever had brown discharge, so i googled it and it said that brown discharge happens after a period or in early pregnancy. i haven't had my period for about 5 weeks now, so i know it's not the blood. i spotted about a week and a half - two weeks ago. i had unprotected sex on my (according to glow) peak ovulation day in september... my sense of smell has seemingly heightened recently and my body temperature seems to have risen a lot and i'm nauseous almost every morning... AF should be coming within the next two days... i've taken 2 tests so far (one right before the spotting started and then one this morning) and both were negative.. i know i'm going to retest tuesday or wednesday morning, but does it sound like i COULD be pregnant?