Dull cramping. HELP!

I am 36 days late for my period. Before i start this out, I thought I was pregnant about a month ago because of a false positive or chemical pregnancy but did some blood work and turned out I was not. Fast forward to now and I have been getting dizzy spells, lightheaded, and dull cramping in my lower abdomen. Anyone have any idea what that could indicate ? Still no sign of a period.