someone to say something?

so me and my boyfriend had completely unprotected sex about 30 minutes ago and he didn't feel himself finish like he usually does and so yeah. we ran up to the store and got an emergency contraception pill for me. but idk there is something inside me that is stopping me from taking it and there is nothing at all that I can think of why I shouldn't. I'm not ovulating right now so the odds of me getting pregnant are very low but still. and I'm only 15 and a type one diabetic so a kid is not an option. I just need some advice please