Implantation bleeding maybe?!

Anastaia • |Wifey 💍| #2👶🏽| #1 👼🏽💔| ttc # 3

I had my period from 9-11. My husband and I had intercourse 13-16. I spotted light pink blood 22-23. I’ve been taking pregnancy test but negative. I am supposed to start my cycle on the 10th September. Question could the 22-23 been old blood or possible implantation?