Implantation bleeding???

My glow calender says I ovulated the 28th of November. Monday December 1st I had slight spotting. I was wondering if this is implantation bleeding or maybe nothing? I haven't had it before, just the normal brown discharge before my period. My period is due December 13th and I usually have the discharge that same week. I have had slight cramping the last two days, but wondering if this is all too soon for any symptoms.