Could Spotting In The Mid Of Menstruation Cycle Be Implantation Bleeding?

I have had normal menstral cycle since giveinfg birth 21 months ago trying to conceive last period starting jan9 for 7 days ,next period due around feb 5-8 give or take ,started spotting on the 28 of jan very littlenot enough realy to use anything this has gone on for abot 6days on and off can this be implantation bleeding