Did Sayyidah Khadijah Marry the Messenger of Allah as a Widow?

English translation. The Indonesian original is the authoritative text. Read the Indonesian original

A widow — which would mean Sayyidah Khadijah had been married to a polytheist. That would mean her pure body had been touched by a polytheist, while from her womb was to be born Sayyidatu Nisa’il ‘Alamin. Is that conceivable?