AF due 27th Jan still nothing

Hi is anyone else in a similar position, AF was due on 27th Jan still nothing not even a light spotting, I have had had stomach cramps since I was due on, pms like being short tempered etc but done a lot of pregnancy tests which are all showing negative no faint lines at all. I'm now cycle day 31 and have a 28 day cycle. I'm going mad wondering what's going on 😥