I never saw the Messenger of Allah (ﷺ) fasting during the first ten days of Dhu al-Hijjah.
“A man from among the Ansar manried a wornan from Bal’ijlan. He entered upon her and spent the night with her, then in the morning he said: ‘I did not find her to be a virgin.’ Her case was taken to the Prophet (ﷺ), and he called the girl and asked her. She said: ‘No, I was a virgin.’ So he told thern to go through the procedure of Li’an, and gave her the bridal-money.” (D a’if)