Help, 8dpo implantation bleeding???

Hi, all. I’m currently 9dpo but I experienced some light pink/brownish spotting beginning yesterday evening into this morning. It is now so light I can barely see it. The 3rd picture was yesterday morning and 2nd was yesterday evening. As you can see, I had unprotected intercourse on the days leading up to ovulation. My spotting began on the 20th. Period expected the 26th, I’ve never had it start early. I bought a few pregnancy tests so I can test in a few days, but I need everyone’s opinions and advice. Have yall experienced this before? Could it be a rainbow baby?

Thank you!