! + 1 =3: I know your don't like my math, but it illustrates your very high odds for being pregnant from the method of "contraception" you have chosen. It is NOT AT ALL effective in preventing pregnancy as there is sperm in the pre-ejaculate which finds its' way into the vagina and upwards to the egg through the Fallopian tube. If you have a period post event get a new "equation" by a more secure method.
Answered 7/26/2015
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