Low Bbt and still became pregnant after ovulation?

Champayne

I temp and using Ava bracelet and it is showing that my temps are dropping for the pst 4 days when i am supposed to be in my fertile window. My lh test strips are getting lighter but for the last couple days i have been getting faint lines on first response prego tests. Has this happened to anyone and actually was prego or became prego?

I’m thinking about calling my doctor and getting blood test just to see where my levels are at