4 months PP, possibility of being pregnant again?

My period was May 28-June 1. I had unprotected sex June 2-3. He wasn’t sure if he finished or not. I guess he orgasmed but didn’t feel any cum come out.

Anyway, now I have light pink spotting. I had the same before I found out I was pregnant with my daughter. Wouldn’t it be way too early to be implantation bleeding?

I know I’m an idiot.