I want to get pregeant without my mom knowing ?

The obvious question: The obvious question is "Why" (assuming one is a teen). Follow this sequence: enjoy high school and college, meet a guy, be friends or be dating, fall in love, get married, settle down somewhere, be sure at least one of you has a good full-time job that provides health insurance (babies have lots of doctor visits and cost money). Usually should keep Mom and Dad in the loop (future grandparents)!