pregnancy tests!!!!

so my boyfriend and I had sex for the first time a couple days ago and I finally told my mom last night. she wants me to take a pregnancy test just to be sure there's No way I could be pregnant. my boyfriend got really paranoid about this and is freaking out that he will be in trouble if he got me pregnant. which I'm 99% sure I'm not. How should I calm him down? it s stressing me out that he's so paranoid. Any suggestions????