Worried that I might have to disappoint my fiancé

My SO and I have been together for a little over a year we are getting married in November and he is already trying to get me to have a baby I want kids just don't think it's in our plans...if it happens I'll be happy but, I'm still in college about to start my sophomore year and he just doesn't understand that I want to wait until after i graduate. He constantly ask if I'm ready to have his baby yet and I'm like I want to just not yet. Doesn't help that he hates the idea of using condoms so eventually it will happen but I'm scared I might not be a good mom if I'm also worried about due dates of papers and studying for exams when I should be focusing more on my baby. What should I do?