1st time getting pregnant was a piece of cake, second time, not so much

It's been almost a year of trying for our second baby and I feel like such a failure over it. I feel selfish for complaining about not getting pregnant a second time when I already have my sweet baby boy. I have a hard time commenting on TTC posts cause I have once already and many of these women want just 1 and struggle. I really feel for them. But fear backlash for wanting more or not appreciating what I already have. I tell myself all the time to appreciate that I was lucky enough to have 1 but the yearning in my heart is still there.

My husband is very supportive and keeps telling me it'll happen again. But what if they messed something up during my c section? Did my body change that drastically after having my son? I'm always thinking "what if". I guess I'm curious if anyone else feels the same.