Spotting day 6 post IUI

Kristin • Two boys and two miscarriages, pregnant and due in May! 🌈
Has anyone ever had spotting after an <a href="https://glowing.com/glow-fertility-program">IUI</a>? Could this be implantation? We had our first <a href="https://glowing.com/glow-fertility-program">IUI</a> on Friday and I have a bit of brown spotting this morning. This would mark 6 days post <a href="https://glowing.com/glow-fertility-program">IUI</a>.