Can it be implantation bleeding

So I have an iud since 4 years ago since I had my first baby so I got my period December 6 ended December  12 since my period ended I been sexually active yesterday when I peed i wipe  I noticed light pink only when I wipe that was only yesterday so is wierd to me I'm using birth control iud copper I never experience this only when I had implantation bleeding with my son can it be implantation bleeding ?? Did anyone experience this