'Rhythm method' may kill off more embryos than other methods of contraception

Interesting, if true.--Dictynna

The rhythm method and embryonic death J Med Ethics 2006; 32: 355-6

The "rhythm method" may kill off more embryos than other contraceptive methods, such as coils, morning after pills, and oral contraceptives, suggests an article in the Journal of Medical Ethics.

The method relies on abstinence during the most fertile period of a woman's menstrual cycle. For a woman who has regular 28 day cycles, this is around days 10 to 17 of the cycle.

It is the only method of birth control condoned by the Catholic Church, because it doesn't interfere with conception, so allowing nature to take its course.