Hi, I am 6 days late. Last period was Aug 5-9 my cycle is usually 26 days exactly. I was scheduled to start my period on Aug. 31. I took a HPT on Sept 3rd and 4th both neg. I've been experiencing noticeable fatigue since about Aug. 30th, Headaches since Sept. 2, and was slightly nauseous last night and tonight. Any ideas? Is it possible that I could be getting a false negative at 6 days late?