Certainly this may work. However, the estrogen in the pill, when taken in higher doses than normal, might make you a lot more nauseous than the morning after pill. If you’re taking the birth control pill already, then it shouldn’t be necessary to use it as emergency contraceptive.
However, if it really is an emergency, there is a chart for how many to take of which brands: http://ec.princeton.edu/questions/dose.html#dose
