Tested early... 6 days before AF

Soooo... I tested earlier... ( I knew I had chances to have a BFN, but I just couldnt wait no more! ?) I am feeling really sick, nauseous and the soreness in my boobs and nipples is killing me! Plus fatigue, moodiness and lower abdominal pain ... Ugh it hasnt been easy... It came out negative and I purchased a pregnancy test that detected pregnancy 6 days sooner (first response).... My question is... Is this result definite? Do I have aaaany chances to get a BFP if I test a few days later??? Are these symptoms just showing because AF is on its way??? Help please!!! Not having answers and the wait is killing me!! ???