Here are some powerful mantras for pregnancy success:
Chant the following Mantra for 41 times everyday from 5th or 7th day of your cycle.
Devaki Suta Govindam, Vasudeva Jagadpathe
Dehimey thanayam krishna, twam aham sharanam vrajaha
Deva Deva Jagannatha, Gothra Vridhi Garbha Prabho
Dehimey Thanayam Sheegram, Ayushmandham Yasashreenam
Garbarakshambigai slogam, which is very powerful
Aum devendhiraani namosthubyam
Dhevendhira piriya baamini
Vivaaha baakyam aarokyam
puthra laabam sadhehime
Padhim dhehi sudham dhehi
Soubaakyam dhehime subhe
Soumaangalyam subam Gnayanam
Dhehime Garbarakshake
Kaathyaayini mahaamaaye
Maha yoginya dhisvari
Nandhagoba seedham dhevam
Padhim Megurudhe Namah
Garbarakshambikai Gayatri Mantra
Aum Garbharakshambigai cha vidhmahe
Mangala Deva dhayai cha vidhmahe
Tano Devi Prachodaya