Help me

So girls 2 days ago now I has a tiny bit of cramping nothing major then like I do every morning sorry tmi I checked my cervix I was greeted with brown discharge not a lot at all but I thought and was coming 1 week early I do have pcos and my cycles are irregular but lately then hay been around 48-50 days on the spot well I thought hmm ok then I haven't had anything scince only tiny little cramps and I feel really run down my mood is a little low I'm tierd more then normal I did and ovulation test and a pregnancy test and they both came back negative only cheap tests but I'm a little confused as this has never happend before any input? Xx