You're not wrong for wanting a baby at all! That is completely normal, especially after an abortion or miscarriage.
It doesn't sound like a baby would wreck your weekends or anything, but even though a baby might not wreck YOUR life, what kind of a life would your baby have? No matter how good of a mom you would be, it is hard on children when they don't have a mom AND a dad that is there everyday.
If you want to be a mom, and you don't care if you have a baby while you're in college, why not get married? Then no one can say that you shouldn't have kids.

I really do know what it's like to desperately want a baby, but please consider what would be best for your children.