I had unprotected sex on the fourth day of my period. Literally the next day I took plan b one step and five days later experienced withdrawal bleed lasting 4 days. Now I'm experiencing a yellow mucus like discharge that dries white but now there's little red streaks in them. Typically I see this a few days before my period but my period isn't due until the 24th. I looked online and my searches keep coming up with pregnancy. Am I pregnant?!?