22 days late, only spotting

Hey ladies!

Just figured I would see if anyone else has had this issue. I am 22 days late for my period (cycle day 56) and have been spotting for about 7 days now. I took a pregnancy test about 5 or 6 days ago and it was negative. Granted it was one of the cheapies and midday urine on no hold but figured it would still be positive by then...

Had a 60 day cycle a few months back but then it came back the next month like clockwork.. I have endo.. could that be flaring up and cause this possibly?