Ladies please read..If I had unprotected sex on the 24th and 25th of june...?

what are the odds Im pregnant if I had unprotected sex 1 week after my period. is been a week since I had sex and right now when I wipe I see a little pink blood. ( no due for my period again, since I only got over a 3 day period 2 weeks ago. ) can implantation bleeding happen 1 week after sex?