Implantation or af?

GirlMom💝 • Wife/StepMommy/Mommy of 2! 1-31-18 & 7-18-20❣️
I woke up this a.m. and after whipping I had some brown blood on the to. It was not a lot more like a sticky string. I mc 4/1 so I'm not sure if this is old blood with AF or if it is implantation. I'm not going to get my hopes up but Ill test on the 13th & keep you ladies posted. Comments are more than appreciated. 😱😩😝😇