6 days early

So my question is how much implantation blood is expected. I started 6 days early yesterday, Slight cramping and a few sharp pains when I got changed I noticed blood in my pants. 
Got angry put a tampon In but when I woke this morning it's not as full (sorry) as it normally would be. I normally heavy when I first start. I don't want to get my hopes up. I am still cramping a little now.