Temp Drop

Carly • 💏Engaged 3/19/16 👰🏻Married 5/6/17 👼🏻Angel Baby 7/8/2016. 👼🏻 Angel Baby 4/15/19. 🚫Separated 6/28/19. Natural ➕ 8/15/19
What is with the two day temp drop?  I'm still above my cover line but I'm getting concerned. First month charting every day and I know I'm symptom checking like crazy. But can someone shed some light on this for me.