Need Some Hope but Honesty

Brit • Happily married for 2 years! TTC Baby #1.
My AF isn't due until Thursday. I am very anxious so I took a "Early Detection - 5 Days" since AF is 3 days away. Well I got a BFN. Is there a chance I still could be pregnant tho? Has anyone had this happened to them but were actually pregnant? I so felt this was the month. ?