I hope you're talking about eating moldy bread, because Egyptians didn't, they used it as a poultice. Eating it would have made it ineffective. Crocodile dung as a birth control in ancient Egypt is widely known, there's even an article about it on Yale's website.
http://www.yale.edu/ynhti/curriculum/units/1982/6/82.06.03.x.html
Egyptians worship dung and used it as a base in just about everything.
http://www.yale.edu/ynhti/curriculum/units/1982/6/82.06.03.x.html
Egyptians worship dung and used it as a base in just about everything.