PLEASE ANSWER-Implantation bleeding?TMI

hi guys! could this be implantation bleeding? i started my period the 17th-21st... has unprotected sex from the 18th up until the 29th. were ttc. or is this regular blood? i had light pink spitting earlier today. and was extremely nauseous. tested neg tho. i know it's too early to test but could this be implantation? i've also noticed my breasts have been hurting terribly the past 2 days.