Implantation Bleeding? Or AF coming?

Latesha • Wife. Mom to 2 angels 👼🏽👼🏽.💙NICU BOY MOM💙6.14.20

I’m so confused. I was expecting af to start yesterday (5/22-CD30). I started cramping on and off a few days prior which is why I figured af was coming (this is how it always starts for me). I took a test on 5/21 and it was negative. My app says af is predicted for Saturday. I never feel like af is coming so many days soon so I know my predicted af isn’t right. Also, yesterday afternoon I starting spotting very light/pale pink only when I wiped a couple times and then it became light brown but it wasn’t much. So I’m thinking definitely af will start today. Today my discharge has been light brown when I wipe. Hardly anything on my liner. Normally I would have started flowing red by now if this was af. I felt pressure and very very mild cramping for a little while this morning and nothing since. This is not normal for me. I’m not under any stress or anything. What do y’all think? Could this be implantation bleeding? Or af just slowly making her way... has this happened to anyone and you ended pregnant? Please help.