pregnant or losing my mind?

my last period was May 31st. and i had sex twice while i was ovulating. and i haven't had my period since May 31st. i've been having the stereotypical symptoms of pregnancy, but i took tests around the time my period was supposed to start, and they came out negative. and my period is always on time and always VERY heavy. i had very light bleeding around the time of my period but it only lasted 2-3 days. i have no idea what's going on. the tests i took where completely negative but my period hasn't showed up, so i'm just super confused. advice? opinions? ANNNDD GOO!!