still no af....even after the negative blood test and urine test last week....im so confused right…

still no af....even after the negative blood test and urine test last week....im so confused right now that I can't sleep....this is not normal.....my peeps come every month astound the same time so I'm lousy this month.....my dr wants me to have an ultrasound next week to see whats going on because it doesn't make sence to her either