Implantation bleeding? TMI!

Im still breastfeeding my 11 month old but we have been trying for our second since January, let’s just say breastfeeding has been a pretty good birth control method haha. But yesterday night and this morning when I went to the bathroom I saw this

It’s brownish, which has never happened before my period before. Could this be implantation bleeding? AF is due in 3-4 days! Fingers crossed 🤞🏻Baby dust to all! Thanks for any input! This didn’t happen my first pregnancy!