For the safety of child and mother during pregnancy write with saffron Surah al Bayyinah (chapter 98 / on a glass dish) wash it with pure water and give it to the mother to drink. Transliteration -Was'bir wa maa sabruka illah billahi laa tan'zan a'leihim wa la taku fee zeekim mim'aa yamkuruninallaha ma al deenat -taqaw wal laa deena hum mohsinoon. Translation - Be patient.
And your patience is only with (the help of) Allah; and do not grieve for them, and do not be distressed because of what they devise. Verily Allah is with those who safeguard themselves against evil and those who do good. There are more specific dua's in the link below if you need to refer to them.
Also, you can listen to the recital of a dua for pregnancy in the second link below. Jazakkuallhun khairan. Ma'a sala'ama.
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