extremely faint lines after very short "period"?

Nicole
I'm slowly driving myself bananas looking at these. I got my "period" at 10 DPO, it was moderate flow for 1 day and light flow for another 1 day. Then it stopped. I felt dizzy and light headed on 11 DPO afternoon. Tested at 12 DPO afternoon because of the funny feeling and temps had dipped, but not below my cover line. Top is 12 DPO afternoon & bottom is 13 DPO FMU... insights?