Still no period!

16 dpo of a 28 day cycle. Dip in temp at 14 dpo but went back up again. Had bowel movements and no sign of her. Had sex and no sign of her. Pregnancy tests appear negative except one that was after the 10 mins but with color. Light cramping, yet no blood. I mean this when I say I have never been late. Only early! I’m so lost!!!!!!