Late period or Pregnant?

This is my first month trying to conceive after a miscarriage back in August (6w5d).  Ever since the m/c my normal 26-27 day cycle is about 30-31 days.  On Monday (cd30) I decided to test due to pregnancy symptoms and got a BFN.  When I wiped (right after I POAS) there was slight pink on the tp (go figure!).  The next morning was the same thing, just a little bit when I wiped.  I really thought AF was due any time, but nothing!!  I do have some light cramps and my lower back/tailbone is killing me, but no AF.  The soptting has stopped since yesterday morning and I still have not started my AF.  I want to give it a few days before I test again just to see if AF comes late; I didn't know if anyone else experienced this and if so what your outcome was.