Hey there! Anytime you engage in sexual activity you run the risk of pregnancy, regardless of your cycle or whether or not you use protection….It only takes one sperm….Anyways, Your period is most likely late right? I would take a pregnancy test just to be sure, Pregnancy tests are most accurate when they are taken with your first urine of the day….If you contact Optionline, http://optionline.org/, Enter your postal code and it will give you the contact info for the closest Pregnancy Help Center near you where you can get FREE and CONFIDENTIAL help, and they can give you a test….It is always best to follow up with your doctor as well….I hope this helps a bit, please let me know what you find out! Love Meg