six days late

Lizzy
My period was supposed to start on 14 June.. it is Now the 20th of June. I took a pregnancy test on Saturday the 17th it came back negative... my breasts were super sore yesterday especially right when I woke up, and then later that day I proceeded to have a sticky brown discharge, not allot thought at one point there was some pink as well when I wiped. I am going to take another pregnancy test tomorrow but in the meantime I was wondering if anybody else has experienced this and what the results were
Thanks ladies:)