On about what day of the menstrual cyle is an egg released?

14 days before mense. The egg is released by ovulation which typically occurs 14 days before your next expected period. In a classic 28 days cycle, this is day 14. In irregular cycles, it can be impossible to predict. Checking basal temperatures, cervical mucus and urine ovulation tests can help to pin down timing. There are programs on line to help you or ask your doctor for advice.