My mom refuses to put me on the pill

Christina

I'm the youngest of my moms kids. I'm 17 almost 18 and I've been dating the same guy for almost 9 months. She won't put me on the pill though and I mean unless she's just that oblivious and still thinks I'm a virgin idk what else to think! Like I my period is soooo irregular and I freak out with my bf every time bc my period is always like 6 weeks late and I'm never pregnant. He's going to college soon in Kansas and we live in Ohio so if I get pregnant then he loses his scholarship there to stay with me. So like what should I do?? I feel like she knows I have sex but she won't put me on the pill so like is she just oblivious?? Keep in mind my older sister is 24 so she's had plenty of experience raising girls and boys. My brothers are 27 and 29