Hi i went to wipe today and I've had a little bit of blood there? Only when I wipe, I had unprotected sex on the 22nd ( only 8 days ago), so today I took a test after wiping and it's come up negative, I'm not due on for 7 days, what could it be? It's not heavy. I looked down the toilet after and it was like a bit of shedding of the uterus, does this sound like implantation bleeding?