How do you know if your pregnant early on?

Try a pregnancy test from the pharmacy, and if you are still unsure, look up a sexual health wellbeing clinic (often free for youth) and they can give you a urine or blood test to check. A few notes: 1. Yes you can get pregnant at a very young age. 2. It is possible that the stress of thinking you may be pregnant will prevent you from having your period at the regular time.