Go to college and get the job you want first. You and your boyfriend need to have your own house to make sure you can live together (some relationships change once this happens), both have good stable jobs and be able to have control of your finances and be able to pay for things yourselves without relying on either set of parents too much for help.
You're 17 there's plenty of time for you to have a family. Be a teen first before settling down and potentialy losing your friends because you have a baby. You'll be getting up all hours of the night and have to stay awake until baby is settled etc etc.
Your relationship might be strong, but having a baby will change it completely. There won't be any time for you and your boyfriend without arranging for a babysitter, everything will revolve around the baby, when you go out for a day it will take 3 times longer, you'll have to make sure you got everything you need for the day for the baby and yourselves.
Honestly I think you would be better off waiting til you're both a little older.