Implantation bleeding vs period

Alisha • Married 6.7.2014❤️baby #1 born 6.2015❤️👼🏻baby #2 born 4.2018 at 21 weeks👼🏻❤️baby #3 born 3.2019❤️baby #4 due 10.2021❤️
AF is supposed to come tomorrow and I've always had very consitent periods...yesterday morning I had very light spotting that was a dark brown color and nothin more for the rest of the day. Today I've had very light spotting again and it's a lighter brown color. Hoping it's implantation!!! Thoughts??