5 days late- symptoms?? Thoughts?

5 days late and no sign of AF. I have tested several times and all are BFN. I know it could be early though too. Some random things I’ve noticed have been that I’ve had a headache for a few days straight, some slight on and off cramping more like twinges (not painful), I was nauseous 2 nights ago, weak legs feeling like I had an intense workout but didn’t . Has anyone else experience any of this?!