This rite allows a Garou to detect when a female will give birth. This is used by lupus to determine when they should return to their pack to check on the newborn and see if they are Garou. Homids find this rite disgusting.
This requires a Perception + Primal-Urge roll against a 7 difficulty. One success will tell the Garou the week of the birth, two success will give a three-day period, three successes will give the day, and five successes the hour.
Source: Ways of the Wolf