Only one child?

How many of you have only 1 child and that’s how you want it? My husband and I have a 19 month old, we constantly go back and forth on having another child or not. I am 27 my husband is 28. We both have siblings and I could not imagine not having my brother growing up, he has 3 brothers. We have been trying for another child for the last 4 cycles but are at the point of giving up. We have thought about adoption also, since having another baby could be very dangerous for me since my first one was and I am overweight. It seems that all of our reasons for not having one more are all selfish. Examples: more work for us, less money to spend on her, needing a bigger house. But then I see other kids with their sibling and they always have someone to play or fight with lol. At least once a week we have people asking us or trying to convince us to have another. We just shut it down since it’s none of their business. I guess I’m just wanting to see what you girls think, I know it is our decision. Any of you only have or want one? Also, are any of you only children? Now that you are adults, do you even care, have you ever cared you were the only one?