We are sometimes confronted by a Christian who claims to be a prophet and demands obedience. When we express doubts, the Christian then rebukes us for our lack of faith.
The prophet Jeremiah had to deal with prophets who gave messages opposite to what Jeremiah said. Whom do you believe? In Jeremiah 28: 9, Jeremiah explains "As for the prophet who prophesies of peace, when the word of the prophet comes to pass, the prophet will be known as one whom the LORD has truly sent."
You are allowed to wait to see if the prophecy comes true, and don't let anybody frighten you into pretending to believe a message that you have doubts about.