What could it be.

the

Period is due the 23rd. Not sure if i ovulated. Im almost 4 mnths pp. But have had 2 reg cycles. Im ebf my son.... But today i have had spotting with little pinkish red and brownish color. Only when wiping. I dnt know if i ovulated because my opk r usually dark but not yet positive or sooo negative. What r your thoughys. ..cud it be my period. ...or implantation