Implantation bleeding?

Nancy
So last Tuesday I had some light pink and brownish spotting. I am on day 41 of cycle I thought It was my period coming. I stopped birth control on October 7th and had my period on the 13th. Then I had more spotting on Thursday but went away. I tested yesterday but I got a BFN. Was it too soon to test? I have no idea when I ovulated or if I did after just stopping birth control. What do u ladies think?