Should i get it

Me and my boyfriend are having sex pretty frequently. We're 17 and im still under my parents insurance. My mom is very catholic and wont give me the pill. Ive asked her for acne and period reasons and she just doesn't cave. She says that she doesn't want me to hurt my potential of having kids in the future and she doesn't want me to be having sex. If i told her i wanted it for sex it would just not turn out well. She would probably not let me go out and definitely wouldn't want my boyfriend coming over and would not trust me with him. I'm debating going to planned parenthood because, a. I would be lying to my mom about taking a pretty serious drug, and b. Its expensive with out insurance and even if my boyfriend pitched in, its still a lot of money. Im looking for imput on if its worth going on. He pulls out and we use condoms. Any suggestions on what i should do? Or ways to approach my mom without her flipping her shit?