Cod Liver oil was used by mid wives in the olden days. it thins the mucous membranes including the cervix. Not sure what the correct dosage would be, but you could research it on mid wives, or natural birth web sites. Also, not to be gross, but sperm softens and ripens the cervix, as well as providing natural antibacterial juices for it. Love making is a good thing. Love making also releases pitocin and helps get things started. Nipple play also releases pitocin. she can pump her breasts in prep for the baby coming. When you breast feed immed at birth, it helps the uterus with the chemicals you excrete naturally.

Good luck!