Why do I want a baby?

My boyfriend and I haven’t been dating that long but right after we started dating we had a pregnancy scare. I was really disappointed when I got the negative test result. Now we haven’t really been careful when having sex or doing anything to prevent from getting pregnant. I’m not sure why I want a baby so bad all of the sudden. Anyone have any advice? I’m very confused..I know we aren’t ready to have a child yet but yet I still hope that I’m pregnant.