It seems there may be some confusion or miscommunication in your question. Typically, only women can become pregnant as they carry the baby during pregnancy. If your best friend, who identifies as male, mentioned being pregnant, it would be highly unusual and may require medical attention to assess the situation accurately.
If your friend is expecting a child through a partner or surrogate, it would be essential to have an open and honest conversation with them about their situation and how you can support them during this time. As a friend, it's essential to be understanding, empathetic, and non-judgmental regardless of the circumstances.
If your friend was referring to someone else's pregnancy or if there was a misunderstanding, it is always best to clarify the situation with open communication. Clear communication is key in any relationship, and talking openly about sensitive topics can help avoid confusion and ensure everyone is on the same page.
Remember to be supportive and compassionate, regardless of the situation. If there are questions or concerns about the pregnancy or paternity, it is best to discuss them openly and respectfully with the people directly involved.