It depends on the number of mature eggs retrieved. If 12 mature eggs are retrieved, 6 will be donated. The probability of one live birth from 6 mature eggs is ~50%, two live births ~14%, and three live births ~2%. If 14 mature eggs are retrieved, 7 will be donated. The chance of one live birth from 7 mature eggs is ~56%, two live births ~18%, and three live births ~3%.