My wife brags about my penis size so I can feel better

I was at the gyno with my wife and my wife said that my penis is 7.5 and brags about it. My wife has 3 kids by me so she's been in the stirrups before. I asked my doctor if he could verify and he said please so he did. He said that he never measured it, just filled out height and weight. But he said I have a 7.5. I think my wife is lying and brags about it so I feel better.