Birth Control/Chances of pregnancy
If birth control pills are 99.7% effective with perfect use what kind of effectiveness would you figure it is with missing one and taking 2 right away as recommended. Is it around 92%
It's a little hard to compare the two, since when we refer to 99.7% effectiveness, that means that if 1000 couples take the pill perfectly for 1 year, 3 women would get pregnant. It doesn't refer to a single couple during a single month. However, in missing one pill and taking 2 right away, chances for pregnancy are very slight, perhaps a 1% chance of pregnancy. When we speak of statistical chances of pregnancy, we're referring to use over 1 year rather than single incidences during one month.