Could it be implantation bleeding??

Hey everyone so I'm due for my period Aug 30 or 31 and I took a pregnancy test this morning negative. I got a positive ovulation test on the 16 of August. And now today when I wipe I have super light light pink blood but only when I wipe. Would this be my period or implantation bleeding? I had sex the 14 threw the 19 of Aug help!