The best way to know if you’re pregnant is to take a pregnancy test. You can purchase one at your local pharmacy or visit a health center. Teen Clinic offers free and confidential testing on a walk-in basis. Some signs of pregnancy include missed periods, nausea, extreme fatigue, and nipple and breast tenderness. Keep in mind that these are also common signs of other conditions, so it’s important to take a pregnancy test instead of worrying about other symptoms.