Is 5-6dpo too early for implantation bleeding?

Had a small amount of spotting. Way early for period. Could it be something? Or maybe it’s just spotting and I’m reading into stuff that isn’t anything! We had to have <a href="https://glowing.com/glow-fertility-program">ivf</a> to have our 3 year old, unexplained infertility. We’re not trying but also not being careful.