Plz help so confused

NeNa
Lmp was July 18 af was due Aug 24 bt did not show Aug 27 28 and 29 i had very light spotting about size of a quarter today is sept 14 2016 i am 22 days late still no af or any symptoms took both blood and urine test both came came negative so confused of how or why im not prego with all the symptoms i had missed period hot flashes increased appetite cravings fatigue emotional plz leave comments or feed back below any feed back will be greately appreciated