About 4 days ago I had brown spotting/ cm ( only when I wipe) and very little amount, moving on the 2nd day it turned light pink again only when I wipe. On day 3 my cm was vibrant red so I thought my period was coming but nothing happened for the rest of that day.Today ( day 4) I noticed brown cm/ spotting once again. Still nothing when I pee or in underwear. My periods are irregular but I've never experienced this. Could this be implantation cause I'm experiencing this 10 days after unprotected sex or is my period coming?