A few weeks ago I had injections in my knee. Before you can get this the have to take a p. test. After 7 pee test and 2 blood test the was no sign on the test. No - or + just a blank test. The dr. had not ever had anything like this. Well that was around the 18th I was supposted to start on the 28th, and that was Dec. 28th and still no period. I took 2 home p test and no sign. Me and my bf have had done it twice and both no breaks or accidents. I do and have had all the sympotans of my period just no period and I am always off. They think I may not produce the right hormon and thats maybe the resaon but I have no idea. Does anyone have or had this or no anyone. please email or reply sonn!!