So I'm on CD6, and my period was light this month. Very light. (Sorry TMI) Lasted 5 days, and only needed 2 tampons per day. So my bbt temp was lowering during my period, and then spiked up the last day and day after my period ended. (See chart) and I was curious, so I took an opk (see photo), and I know its definitely negative. But I've never had a second line after my period. What do you guys think? I have no idea what it could be. Haha