I get cranky right before AF but some of my BFPs I was actually stupidly emotional for a day around 7-8dpo. I ruined mothers day last year as I got really upset over my gift and didn't want to do anything all day, I found out a few days later I was pregnant.
Sore boobs is something I get for BFN cycles and also BFP cycles and sometimes not at all. It is hard to guess this early based on symptoms!
Fx you get a BFP!