Not Sure If Implantation Bleeding Or AF is Coming

Lelu
Yesterday I Spotted Very Light Only When I Wiped . It Was Pinkish Will A Little Brown To It . I Thought My AF Was Coming So I Put A Pad On . Woke Up This Morning And Have Absolutely Nothing On Pad Or Nothing When I Wipe . Not Due For AF Until Another Four Days .... Implantation Bleeding/Pregnant????