This 19 minute yoga nidra was created for one of my pregnant clients so that she could connect with both of her babies while listening to the relaxation. See also the ones for a single pregnancy and for a baby in the breech position. There are more at pearlsofbirthwisdom.com including a postnatal one. Yoga nidra was invaluable to me post birth and my main practice for two years afterwards.
Recorded live beneath a tree in a garden in Amherst, Massachusetts, specially for the Fertility, Pregnancy and Birth online summit with Cathy Ospina (https://thefertilitypregnancyandbirthsummit.com/) - this nidra is teeming with life: the sounds of the crickets and the birds are present throughout the practice, offering a vibrant natural audio landsacape in which Uma's voice keeps a steady presence.
I recorded this especially for a client whose baby was breech to support the baby to turn head down. Please see also the handout on my website www.tessayoga.co.uk/pregnancy-resources for asanas to help.