Please help.

Two days late, have gotten a negative test, but have fatigue, food aversions, food cravings, nausea, some cramping, and now the discharge (it’s very abnormal) I don't have any of my usual pms symptoms at all. I think I might be pregnant but im just not putting out enough hcg for the test to pick it up. Has anyone else had this? If so what happened? What could all of this mean?