I have been tracking/testing when I ovulate with first response digital test because my periods are irregular. I took a test this morning and did not see the response in time (which normally happens but when I eject the strip it will show NO) but this morning when I ejected the strip nothing showed up on the screen. The instructions say that if it is a yes then it will automatically shit off, but I'm suppose to start my period Friday. Has anyone else had this happen? I don't know if I'm ovulation or not.