It is unlikely but there is still a chance. If you miss your next cycle, definitely take a home pregnancy test!
Good luck! :)
There is more of a chance than 0% but less of a chance than if you had the sex a few days later.
So there is less of a chance?
Well, not usually. If it is the tail-end of your period, and if some of the sperm makes it up a tube and waits there, and if you ovulate a little early, you could get pregnant. The tampon won't prevent it, and the timing is not entirely favorable. You aren't ovulating now, and many women wouldn't ovulate until mid-cycle, like day 14 from the first day of the period, so by then the sperm would be dead. But surprises happen.