Relationship advice?

I am 14 and have been texting this guy in my school, he is my age. I go to school in a pretty small program so we are all pretty much stuck with each other for all of high school. We started talking by studying over the phone. And just know that this guy is hot and I constantly hear people talking about him in the hallways and how cute he is. We have been talking since the beginning of the year and one day when we were bored after we finished studying early we played dirty truth or dare. We played again about a month later (a couple days ago) and he asked me if I was ok with nudes. I am and teased him for a little while until I ended up sending them to him. this was actually something that I wanted to do and I didn't feel pressured. He has sent nudes to me too. Just btw we don't talk that much in school even though we see each other a lot , our friend groups just don't get along. We eventually started sexting and he said he wanted to have sex with me. I kind of want to but I'm worried about getting pregnant. Also that our relationship will get messed up if I do. One of my friends thinks he's just using me... and I'm just not sure anymore.