Completely turned off from having anymore kids after first pregnancy

Am I the only person completly turned off from having anymore kids I am currently 26 yrs old and 31 weeks pregnant with my first child whom I wanted so bad but now I feel like im 1 and done this was the most miserable and unhappy pregnancy ever its completly not what I expected and plan to write a book about it I just can't see myself going thru this process again I just can't wait for my baby to be here and get all of my love but I feel bad that she may never have any siblings am I being selfish???