no sign of af?

Jasmine

getting pretty bummed and irritated. it's been nearly 6 days since my projected af and still no sign of it starting. I have been feeling some symptoms mainly a lot of nausea and cramping to where I felt I was pregnant. But after getting negative tests and even a low hcg blood test result I'm not so sure..has anyone experienced this before and were actually pregnant? because I'm dying over here...