Should we have a baby?

Me and my hubby want to have a baby so bad, he has a child from a previous relationship already. I am in college for the next 2 years but me and him have already decided since I've stayed home for the past year I will continue to not work while in college, which I am so grateful for. I take care of our family (him, his son, myself) while I get to go to school. We would love to have a baby of our own! Money would be tight but we could do it. We want this but I'm so nervous! Should we do it?? I think so!