Early symptoms of pregnancy?

My breast have been sore, my breasts also feel fuller and heavier, I’ve had a sore throat on and off, I feel bloated or having a “fat” day (for lack of better description), I’ve either very emotional or cranky or completely happy. Also nausea every morning. Lastly, my cat who has been independent is either laying on me or always near me lately. But I can help but think all these symptoms are just in my head! AF due in 6 Days! The only similar symptoms to my period is that I get very emotional but usually only the day before my period is due! Took a test and got a BFN. 😕 (test probably didn’t detect in 6 Days like first response though)