Nails that curve over are just that. Clubbing is when your fingertips look like spoons at the end. I have a friend who has clubbed fingertips and it's VERY noticeable.
here's sum pics
In the first pic it looks kinds normal, but in the second pic, the nail isn't flat from a side view, it's sorta raised. Also what was your friend's condition if you don't mind me asking?
Also I glad that you have beat cancer, it is truly a blessing :)