Spotting 6 days before period

Cl

Hi, I was just wondering I had spotting 2 days ago (6 days before my period) I thought was implantation bleeding because I had it before and took a pregnancy test and it was positive but this time it was negative I took 2 pregnancy test already (yesterday and today) . I just wondering maybe it's too early ? When I had implantation bleeding before and took pregnancy test that day it came out positive. Oh yea my nipples been itching for 2 weeks now.