Pope Celestine composed this for his sister! It is found in a lot of old English missals for the Sarum Rite. I found it in Volume 2 of the Sarum Missal translation.
I think it is a very good prayer. It was designed for priests to use, as a Mass intention.
O God, Who didst sanctify the Blessed Virgin Mother, Mary, both in conception and delivery; and Who, by Thy mighty power, didst deliver Jonah from the belly of the whale:
Protect Thy servant who is great with child, and visit her with Thy salvation; so that the child she beareth may be safely delivered, and may attain unto the grace of the Laver of Salvation.
Through Christ Our Lord. Amen.
Receive, O Lord, we beseech Thee, our humble prayers and oblations; and preserve Thy servant under the shield of Thy protection. And as Thou hast ordained…
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