So confused!! Implantation bleeding?

Jennifer • 41, Mom of 1, trying for Rainbow Baby.
I'm only 4 dpo. Since yesterday I have had heavy eggwhite cm, sometimes tinged brownish/light pink, slight cramping on and off. The week before I ovulated I had eggwhite cm, but creamy cm when I actually ovulated. It couldn't be implantation bleeding this early- could it? Last month I didn't ovulate at all. Any input/opinions is appreciated!!