There isn’t anything specific during pregnancy and no particular duaa. Make general duaa to Allah and ask him for help.

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Yes you can recite your daily adhkar while you are in your menses and increase it as much as you wish but don’t limit it to a specific number.

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There is no evidence from Quran and Sunnah to indicate that the dua of a pregnant woman is more superior to the dua of others. Allah the Almighty answers all duas! Kindly refer to the following link(s): https://islamqa.info/en/1945

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