This is a prayer your supposed to say when trying to conceive, it comes from a book called prayers that avail much.

When desiring to have a baby

our father, my spouse and I bow our knees unto you. Father of our lord jesus christof whom the whole family in heaven and on earth is named, we pray that you would grant to us according to the riches of your glory, to be strenghthened with might by your spirit in the inner man. Christ dwells in our hearts by faith, that we- being rooted and grounded in love-may be able to comprehend with all the saints what is breadth and lenghth and depth and height of the love of christ, which passes knowledge, that we might be filled with all the fullness of god.
Hallelujah, we praise you, o lord, for you give children to the childless wife, so that she becomes a happy mother. And we thank you that you are the one who is building our family. As your children and heirs through jesus christ,we recieve your gift-the fruit of the womb, your child as our reward.

We praise you, our father, in jesus' name, for we know that whatsoever we ask, we recieve of you, because we keep your commandments and do those things that are pleasing in your sight.
Thank you, father, that we are a fruitful vine within our house; our children will be like olive shoots around our table. Thus shall we be blessed because we fear the lord.

Scripture references
ephesians 3:14-19 1 john 3:22,23 psalm 113:9 amp
psalm 128:3,4 amp psalm 127:3