When my daughter had her son, she ended up having a C-section, which is basically like having an abdominal surgery.
When she was trying to get pregnant again, she was never able to. She didn't know that she had developed adhesions from the scar tissue from her surgery.
These adhesions and scar tissue were preventing her from getting pregnant again. Eventually she was able to get pregnant, but had to have another C-section.
She was told the same thing would probably happen again. She didn't want any more kids, so wasn't as worried about it this time.