Implantation at 4dpo?

Kristen

Good morning! I had

<a href="https://glowing.com/glow-fertility-program">IUI</a>

on Monday and am now 4dpo. I had some small pink bleeding when I wiped this morning. We haven’t had sex since Friday of last week, so I don’t think it’s that. Is it possible to have implantation bleeding at 4dpo? I know they say 6-12 days but I don’t know why I would have any bleeding right now 🤷🏻‍♀️