Should I be worried

AF was due to come on the 10th, on the 6th started feeling nauseous, dizzy and sharp pains in my breast. Wiped on the 8th and saw a little bit of blood, put a tampon in, next morning took it out and nothing. On the 10th woke up with a spot of blood on blanket, wiped but nothing else. Put in a tampon, later that day it was full but with dark blood, put another tampon and next day was nothing. All this while still feeling symptoms. Took a test on the 12th BFN and a test today 17th still BFN but still feel nauseous and small sharp pains in breast. Should I be concerned?