My boyfriend wants to marry me at 17. What should I say?

My boyfriend, Carson asked me to marry him last night!! We already had a kid together, her name is Olivia and she is 16 months old, and she is the love of our lives. I told my mom about him proposing, and she wa aggravated at first, then was very happy for me. I have a wealthy family who supports Olivia, Carson, and I. And she said that if I chose to say yes then she would pay for the wedding and all that. But I'm still only 17. The only reason I would say yes is because of our daughter Olivia, and also because I love him. What should I say?