11 days late and negative results...

Has anyone else had this happen? I'm currently 11 days late and have taken at least 6-7 different tests and are all negative. I do feel different and have had pregnancy symptoms (fatigue, headaches, soreness, strong sense of smell, and mild dizziness/nausea), however I'm concerned that I haven't gotten my period or a positive test result. This cannot be normal. I'm guessing I have a lower hcg count?!? I'm going for a blood test next week. Anyone else experience this and result in a healthy pregnancy?