Sorry to throw a spanner in the works, but as a teenager at high school we were visited by a "young mums" group... Ie teenagers and they said the whole "can't get pregnant whilst with af is a myth. Thought the whole idea was gross but then one of my friends falls pregnant by accident while she had af and was asking menof it was possible... I said if you have then obviously it is! Guess it supports what the "young mums said"! X