Looking on the internet deeply has found these results:

I must confess that I have had is the most popular phrase on the web.

I must confess that I've done something 10 results on the web	I must confess that I have had 14,010 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Based on these reasons, the court dismissed Slobodrian's appeal. I must confess that I have had a change of heart concerning donations in kind over the years. And, indeed, I must confess that I have had a website in the past; I still do, in fact, though I long since quite trying to entice people to visit. Most people simply�... Having said the above, I must confess, that I have had strange experiences in my life that could be interpreted to suggest that my life was predestined to unfold�... I must confess that I have had my doubts that it could be open by winter, but it looks as though the contractor is throwing everything they've got into getting the�...

I must confess that I've done something

10 results on the web

I must confess that I have had

14,010 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Based on these reasons, the court dismissed Slobodrian's appeal. I must confess that I have had a change of heart concerning donations in kind over the years.
And, indeed, I must confess that I have had a website in the past; I still do, in fact, though I long since quite trying to entice people to visit. Most people simply�...
Having said the above, I must confess, that I have had strange experiences in my life that could be interpreted to suggest that my life was predestined to unfold�...
I must confess that I have had my doubts that it could be open by winter, but it looks as though the contractor is throwing everything they've got into getting the�...