Implantation Bleeding?

Camber • After 3 years of TTC, our first baby is due 5/1/2018. ❤️ We’re having a baby BOY! 💙🐳🐟💙
Hi everyone,
​My ovulation day was 9/30 and yesterday (10/6) I started experiencing light pink spotting. It was very light and seems to be almost gone today. Had some mild cramping in lower back. AF is due 10/17. This happened only six days after my ovulation day. Can implantation bleeding occur that soon? I've never experienced anything like this. 23, TTC #1. Any response is appreciated! Baby dust to all. ❤️?