Implantation?

Nakitha

So yesterday I started spotting 4 days before my expected period. (Which is werid for me my period doesn't normally come early a few days late if anything) but at first I thought it could be implantation bleeding but it got a little heavier but still not enough to get on a pad just when I wipe. It's pink. But how long should implantation bleeding last and how much is normal? My last pregnancy it was only one day.