Because you have missed your period, you need to take a test. You can get one of these at a chemist, or some sexual health clinics for youths do them free. When i went to the dr, i thought i was just sick, turns out i was pregnant, but all she did was give me advice and pamphlets on my options, she also took swabs and ordered blood tests for me. She then booked me in for the following week to see what i had decided (i knew what i was going to do before i left).
As for telling your mum, its going to be hard, im 18, was 17 at the time, but i didnt live at home and it was still hard, i was terrified that she would be disapointed, and she was. But she is still my mum, and ive recently had to move back home because my partner and i split up >

friggen men. I just walked in to her room and said mum, ive got some news. Im pregnant. And then i burst into tears, i was absolutely terrified. She told me she was disapointed, but that she would be there to help me the whole way, and she has been. shes now more excited than me, what with 4 weeks till she becomes a grandma for the first time! Your mum will be disapointed, maybe angry, but she will eventually come around and be excited. what are you going to do if you are pregnant? Plan your next steps before you tell her, it will help ease the blow because you will get 80 billion questions. Then again, you might tell her and she say I know, it has happened...my sister in law told me i waqs pregnant 3 weeks before i went and got tested. The longer you wait before you get tested, the worse off your baby will be and the harder it will be to tell your mum. This is the time when you need to be on prenatals/folic acid, and this is a crucial part of babys development. You made adult choices, now act like an adult.