To understand where the seven-day break really came from, we need to know a bit about how this society-changing drug works:
Studies have shown repeatedly that our medical system has an inherent bias against women.
The society changing contraceptive pill shows our medical system has a bias against women.
And with that logic pours petrol on itself, strikes a match and leaves the building. Pity about that science and civilisation thing but it had a good run, eh?