Advice about implantation or possible period

Gabrielle

Im trying to figure out if I should test My fertile window was from 8/28 to 9/3 had sex all of them started spotting pink when I wipe on 9/12 until yesterday it got light and red for on day not enough to soak a panty liner then went back to spotting my period should've started on 9/16 but the spotting ran into it anyone experience this...