Stopped taking the pill.

I just got my period it lasted 7 days and I’m still having pains (cramps. Back pain. Stomach ache). I was on the pill but a few weeks ago I missed a day or 2 and I took it late quite a bit. Friday I stopped taking it because me and my boyfriend are trying for a baby. But I think I may be pregnant. Could the bleeding have been implantation bleeding? It was very light and brown but the last day it was heavy and dark red.