Well, having had that "one more" baby. And now I have four. Two would be so much easier. I do not regret my fourth at all.
For 5 years I had only three. There wasn't an odd man out very much because of their ages and gender , I think. Oldest is boy and then next two are girls. The girls often play together.
If you are "on the fence" about it, I would wait until your youngest is older. Give it another year.
I love this 5 yr gap I have. So much easier than having a 2-3 yr gap where you have a toddler to chase and keep up with.
I also was trying to convince myself to stick with only two children because dh only wanted two. But we had an oops. I thought I had more safe day and I was wrong.
It is a very personal decision.
for you
Also realize that you will be having a c-section.