What is another word for about to become a mother?
Pronunciation: [ɐbˌa͡ʊt tə bɪkˌʌm ɐ mˈʌðə] (IPA) 
There are various synonyms for the phrase "about to become a mother," depending on the context. Some common synonyms include "expectant mother," "pregnant mother," "mothers-to-be," and "prospective mother." These terms all indicate that a woman is in the process of preparing for the birth of a child, either in the near future or within the next several months. Other possible synonyms might include "soon-to-be-mom," "impending motherhood," or "maternal expectancy." Ultimately, the most appropriate term will depend on the specific situation and how the woman in question feels most comfortable identifying herself.
