Yes, it's possible that you could be. It depends on how long your cycle normally is and how long your period is.
If your period ended 17 days or less before you expected to get your next one, it is possible.
Take a pregnancy test to be sure. If it's been over 2 weeks since you had unprotected sex and the test is negative, it's likely that you are not pregnant.
Good luck,
Rachel Inbar
www.fertilitystories.com