Pink cm

Okay so I had sex 7-8 days ago unprotected, he came in me ofc and now today I had pink in my discharge. I’ve also been cramping the last couple days and my period ain’t supposed to start until the 27th of September, but last night I also had sex and he came in me so idk if it could have been from sex but I’ve never spotted after sex ever. I’m kinda confused, maybe implantation or just from sex ? I’m a mom of 1 and I had implantation from her and it happed 7 days after I had sex as well.