It’s hard to estimate your chances of pregnancy from one sexual encounter. It’s best to assume that without any contraception, being young (and presumably fertile), you are at high risk of getting pregnant. Get to a pharmacy ASAP for Plan B®, also known as the “morning after pill.” A prescription is NOT needed for Plan B® – just talk to the pharmacist and they will sell you the medication after confirming that you are over the age of 18 (Arizona State Law). Women 17 years of age or younger will need to see a medical provider for a prescription (this may involve parental consent since the law dictates that minors cannot be treated without their parent’s or guardian’s permission).