8 dpo 5 days until AF

Rach

I took a first response early response test today because AF is due in 5 days (Friday, today is Sunday). I am 8 dpo, my cycle is 25 days and I got a BFN. Did I test too early or do you think it’s not in the cards this time? Honest insight would be helpful. My boobs hurt terribly but not uncommon because sometime they do hurt as a PMS symptom.