This depends when Fajr is due. You must not depend on the Hanafi timetable as their Fajr and Asr are wrong and not according to the sunnah.

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If the Time was truely due, one can pray even if the athan wasn’t called. In Hanafi masjids, they delay Fajr and Asr prayers. One can pray before them as per the majority of Muslims.

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If you forget the qunoot in witr, you can continue your prayer without doing it. Kindly refer to the following link(s): Is qunoot mandatory in witr? https://www.youtube.com/watch?v=C-Im5zQVnQQ

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