Here are some chants/songs but since you probably do not know the tune, they could be poems. Or make up your own tune.
I am opening:
I am opening up in sweet surrender
To the luminous love light of the one
I am opening up in sweet surrender
To the luminous love light of the one
I am opening, I am opening, I am opening (repeat)
^^ I sang this to myself during labour :-)
The River Is Flowing:
The river is flowing (or: The river She is flowing)
Flowing and growing
The river is flowing
Down to the sea
Mother carry me
Your child I will always be
Mother carry me
Down to the sea
Power Spot:
You gotta find yourself a power spot
Bring along a spoon and cooking pot
Bring air, bring fire, bring water, bring earth
And a new Universe will birth (repeat)
Here is a link to a site called Birth Beads with information about Blessing Way ceremonies - chants and songs:
http://www.birthbeads.com/Chants.html
The Woman Am I song and The Circle Is Open are very popular in my area.
Good luck and enjoy!!
Rhianna