I was suppose to start on sept 15th and it is sept 26th and still no period. I have not had any spotting or cramping, I have been tired, I have been having headaches, and I'm 12 days past due. I took the ClearBlue test on the 6th day and today (12th day) and they both said "Not Pregnant". I have a pretty acturate cycle of 28 days, and right now I'm going on 39 days in my cycle with still no period or cramps. How can I be this late and test negative on the hpt? I'm thinking, most likely I am pregnant....so I might go to the doctor and have them run a test. Any advice or help would be great.