Any experience with 3+ c sections?

I just had my third baby and 3rd c section 4 months ago. All normal pregnancies and uncomplicated sections. During my 3rd my doctor said he feels confident that I can have another just that I need to wait at least 18 months before getting pregnant again. But the risks freak me out so bad. I feel selfish for wanting 1 more baby when I have 3 perfect and healthy children. I’d never want to risk mine or a babies life but can’t shake that we have 1 more baby in a few years. Does anyone have any experience with 3+ sections good or bad?