If you have had sex with someone, then there is a chance of pregnancy. This chance skyrockets if it was unprotected sex (meaning you did not use a condom or any form of birth control).
If you know when your period is expected, you can wait and see if it comes. If it is dramatically late, you can take a pregnancy test. Make sure to read the instructions carefully - some will not be able to detect a pregnancy very early on.
You also mention your mother. You may want to consider whether you want to confide in her. You can access sexual health services for advice, but be warned that (depending on where you live) they may not be confidential. You are within your rights to phone a local clinic or agency and ask if they will inform your mother of any visits.
In the meantime, stop having unprotected sex. Make sure your partner knows how to use a condom properly, and if you do not want to get pregnant, don't have sex without a condom.
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