Spotting...?

Hello all!

Sooo I woke up this morning and had the below on the TP. It happened only 3 times and nothing since.

I O’d on July 4th and AF is due July 19. Ive never experienced any spotting mid cycle like this. So I’m so confused as to what could be going on.

I don’t have many “symptoms” out of my norm. I’m a bit nauseous but that’s not unusual for me cause I have gastro issues.

I know there’s a million things it could be, and implantation is super rare. But I just want to see others experiences.

Thanks in advance ladies