43 yrs old, period is later than expected, I am very bloated and gassy, but have not eaten a lot. I have been craving salty items but not drinking as much water as I usually do. Been dealing with marital problems, and have an upcoming hysterectomy surgery on Wed. Took a pregnancy test yesterday (it was negative), one month to the day since my last period started, and my periods usually come every 3 weeks. (Husband had a vasectomy several years ago.) Could this all just be stress related?