CD 22 LIGHT PINK SPOTTING...CAUSE FOR CONCERN?

Good day ladies!!! So I'm on cd22 and I noticed when I went to the bathroom some light pink spotting which was only visible when I wiped. I went to the bathroom to check a few hours later and noticed some light spotting which was light pink on my liner and brown. The spotting has turned to brown and stopped. I am due for my period in 9 days. So my question is Should I be worried? What could cause this spotting? Also, I Bd the first and last two days of my fertile window according to Glow! Thanks for all the responses and baby dust to ALL!