ovulation bleeding?

ET ☝️💫 • Boy mom trying for #2 🤞

I'm currently 4 dpo. My SO and I BD two days before and the day before I got a positive opk. Earlier when I went to the restroom I had very light pink spotting and it lasted about an hour then completely stopped. I was told it's probably ovulation bleeding not implantation bleeding but I've never experienced either so I'm just wondering do you think this is ovulation or implantation bleeding? How do you know the difference between the two?