period

lo

so im about 26 days late on my period. ive taken two pregnancy test both negative. ive always had a pretty regular period and ive always been able to pretty much guess when im going to start by the way my body has been feeling, like back achs, my mood and eating habbits that day. everyday for like the past two weeks I "feel" my period coming i just haven't gotten it. do i need to go to the doctor? should i just relax and let it happen?