Pregnant ?

Netta.

Y last period started on July 31st till August 6 my periods are inregular I went to the obgyn on the 18th of September and my pregnancy test was negative earlier this month I had allot of brown discharge one time I seen stretchy brown discharge on tissue and one time were I wiped and it was blood for a little bit I did have sex 3days after obgyn appointment should I take another test or is my period gonna come