Implantation Bleeding

Anjellyn
October 10 when me and my partner have a sex at night. the next day i feel something white mensturation is coming out from my vagina but when i pee it was pink. its very light and after is brown. its only last for 3 hours. i am wondering if this is a implantation bleeding. waiting for my mensturation again but it looks like late.. hope this is it..  does somebody experience this before?