Congratulations!! My older boys are 15 months apart. It was kind of the same with me - I was shocked at first and in no way ready to have another baby so soon! We were young (I was 22), broke and struggling not to get evicted out of our apartment.
We somehow made it work and my boys are 21 and 20 now. They are the best of friends.
You brought me back in time, lol. ((hugs))