I am a 22 yr old female and I was suppose to start on the 13 but its now the 16th and no sign of it yet. I am always on time not ever missed a peroid before, I am always naused and light to mild cramping but not spotting, tender breast color change of one nipple and not the other. I am always tired, moody sometime emoinal. Weight gain, headach's, going to the bathroom more then I normaly do, can anyone help me please.