How long does it take for birth control to take effect?

I've heard so many different things.


Particularly I'm wondering about Alesse.How long does it take for birth control to take effect?
I always thought it was 1 full cycle but after researching it seems to be after 7 days of taking the hormonal pills that you are protected...





http://www.thewomens.org.au/ThePillHow long does it take for birth control to take effect?
you would have to look at the box, but usually it's about a month. it usually has to go through a whole cycle to become effective.
It takes one full cycle (month) to reach maximum effectiveness. You should use a back-up method of birth control during the first month.
One full week of taking the pills.

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