Abortion pressure!

I found out about a week ago that I'm pregnant. My boyfriend and I did a lot of talking about what we wanted to do, being that we're both 18.  My boyfriend was more than willing to stick by me and do whatever I felt I could handle. We decided we wanted to keep the baby. Last night when I told my mom she instantly started pressing me to have an abortion. While it's not effecting my decision to keep my little peanut, it is taking a huge emotional toll on me. Even though my boyfriend has expressed multiple times that he isn't worried about the "fun" things he has to give up, I can't stop thinking about how much my mom stressed this will ruin his life. Can anyone offer any helpful advice for how to deal with the pressure my mom is putting on me?