Need advice 😢😢😢

My period is not due to arrive until the 24th. I apparently ovulated around the 4 or the 5th. I just went to the bathroom and when I wiped there was light pinkish/brown blood with a tiny tiny tiny red clump of blood. I have minor cramping not too bad though. Has AF decided to come a week early or could this be implantation bleeding? I've wiped a few more times after sitting in the bathroom for an hour trying to figure this out and there has just been a tiny amount of pink blood when I wipe on occasion. If in fact this is implantion bleeding, how long does it last?