Has anybody cancelled a SAT subject test score after taking the test?

Hi. I took the SAT Math today, but I didn’t do well. SoI sent the cancellation document to the College Board.
Is there any disadvantage of canceling a score? I mean will colleges be able to know that I have cancelled a score?
And, how can I know if the cancellation is received or not? When the score is available on the website, is it going to show up like “score has been cancelled”?

What happens after canceling a score?

If you cancel a score, the only disadvantage is that you won’t be able to see how you did on the test. Canceling is recommended if you think you did poorly on the test. When you cancel your score, you don’t get to see how you did. The score does not get sent to colleges.
Colleges will not be able to know that you have cancelled a score. However, if you don’t cancel your scores by the allowed date, then your scores will be on your record.
CB notifies you whether your scores are cancelled via email (this is how I got mine).

Thank you so much!