I truly think more kids just makes the love and energy explode. I loved having siblings and am still close to my sister to this day. My brother? Not so much.
I have friends who are from huge families, 8-12 kids kinds of families, and I would rather go to their mom's house for any holiday than do ours alone. They have fun goofing off, playing together, sharing pain and joy, they always have someone they can turn to and find help or comfort.
I hated only having one child but that was all I could carry. My sister lost 3 before she had her one child.
I think it's easier the closer together they are so if you are going to have more kids I suggest you consider it deep down, because now is the ideal time to have another. It won't break the whole thing if you wait even another year but this is a great time to do this.
If you pray then do so, go to a quiet place and get down and earnestly pour your heart out. Then sit and listen, if you don't pray this is still a good exercise but just talk to yourself out loud, and sit still, eyes closed and feel, feel how your heart/spirit/soul is, is it peaceful with having more kids?, fearful?, calm and content with trying for another?, you have to hear what you feel inside and sometimes the world gets in our way. That's why we sometimes make a decision then regret it and we don't know why. We didn't know what we were truly feeling.
Also, hubby comes into this. Is he going to grow resentment towards you if he can't have the family he wants? Will he seek out someone that will give him the larger family he wants? Will he share the responsibility in getting up during the nights? Will he be an active participant in this child's upbringing?