Days past trigger and DPO

Brookelyn

This cycle I did femara 5mg 3-7. Cd13 I triggered at 9pm with one follie. Been testing my trigger out with fr and 88c. I thought it was supposed to be getting lighter not darker? It’s steadily been going lighter but this am (both with fmu) it was significantly darker. Now the next issue, going by the pic below, do I have my dpo wrong going by trigger days? Sorry this is my first cycle with trigger just a little confused