Okay so my period is always on time and never late! I took a pregnancy test yesterday afternoon and it was negative. I did change my diet-- I don't drink as much soda anymore and more water. I have no signs of my period coming. I had one small cramp yesterday and then nothing. My question is is it possible I'm pregnant and just don't have enough hcg? And also how long can a change in diet delay your period? I didn't quit drinking soda I just don't drink as much.