Pregnant or just late?

I don't know. I sm on CD 41. Af was due on CD 32 or at least by CD 34. I have had 3negative HPT's. I don't know what is wrong. I have been doing acupucture 2x a week and my pulses are fantastic. Nothing out of balance. Any symptoms I have could be pregnancy or the onset of AF, so that is why I am compfused. I have had quite a bit of mild cramping or a pressure feeling in my lower abdomen. Since I have never been pregnant, I do not know what to make of it.