if I took a pregnancy test today and it was negative that there is still a chance that I could be pregnant or would you not worry?
If you are already a little late I would guess you are not pregnant. At least for me, the two times I was pregnant I was even able to test a few days early and get a positive. So, if you were pregnant, most likely you would have gotten a positive test by now, though I realize for some people it takes longer.
I would guess you are like the rest of us in this thread..having an off cycle!