[HowlingAtTheMoon]

If he's come in side you then regardless of birth control there's a possibility, but right now is a little early to worry your period is only one day late and it was only 6days ago that you had "unprotected sex" any sperm that got into your womb could still be alive. Go out and buy a home pregnancy test or a multi pack if you can. Do one today if its positive then obviously you'll need to talk to him and your parents and make an appointment with your doctor. If it is negative you need to wait 14 days then do another test to make sure if that's negative too you should be fine if your next period still doesn't come go see your doctor cause there may be another reason for that. Obviously of the second one is positive then like I said before boyfriend, parents and doctor.
Hope this helps xx