I Really Need Advice

I'm just going to get to the point. I may or may not be pregnant. I'm 15 and have been in a relationship with my boyfriend for about 5 months. I've always been regular, always getting my period a month and a day from the last. I've never taken birth control and have never used protection.I've never had sex with anyone else either. I know, I'm an idiot and asked for it. Trust me, I've gotten the lecture before, but I want some advice on not only how to tell my mom, but what should I do?
Abortion?
Adoption?
Keep?
I'm only a week late and I really don't know for sure yet. I'm going to get an early pregnancy test from the store soon, but what if I am? I may not sound so distressed, but really, the first day I considered it I cried and told him I didn't know if I could do it or not. He wants to keep it. We're both pro choice, so an abortion is an option, but I want a child. So if I'm going to have a child, why not this one? I'm not really thinking about ending a life because it's not the right time.
There's a place and a time for everything my mom always says.
If I am then that place and time is coming within eight months.
Please help me. I just want some advice.