Help! conflicting HPT

I'm 5 days late on my period. Have some mild cramping, breast tenderness, fatigue. I know from tracking my ovulation I ovulate late ( peak ovulation showed on October 10th )......but my periods are generally all 29 days which means I should have started 5 days ago. I have been testing and getting faint lines on the first response test, but then took two other ones today and maybe see a faint line on the CVS brand but clear blue says not pregnant. Any advice? Could it be that I ovulate late so my levels haven't risen high enough yet? Or am I seeing indents and Evap lines?