In denial (tmi)

So I was convinced that was month was my month. I started bleeding 4 days before AF was due and it's been a lot lighter than normal for me. The color has either been brown or a light red and less clots than usual. I mean this is day 3 and usually I'm like a wide open water facet by now (TMI). I was thinking this was implantation bleeding but do you cramp with implantation or is this just an unusual period?