implantation bleeding?

Megan

I am 4 months pp and I have not yet got my period back. two days ago I had a bit of bleeding in the morning (light pink) and then no more for the rest of the day. then the next morning I had a bit more bleeding (light red) then no more for the rest of the day. today I haven't had any bleeding. I thought at first it was my period but now I don't think it is. could this be implantation bleeding?!