OK so me and my boyfriend had sex, and I know how guys pre-. And he always seems worried that I might be pregnant. And now that I've looked up the signs of pregnancy the only sign that I have is nausea.. my period was supposed to come Thursday. And it is now Saturday night. And it hasn't come yet. I can't go to the doctor because I'm in school. And I can't tell my mom because she will freak. Help me please?