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How quickly do birth control pills work?

I just started taking birth contol pills, so I'm still in the first package, just starting week four. I am sexually active with my boyfriend, and was just wondering if the birth control pills are effective in the first package, or if it takes a few sets of pills to really work. Any advice/help is appreciated.

Public Comments

1. i think it takes two weeks to kick in ask ur doc
2. when i started my bc the doc said to wait for 2 weeks but just to be safe i waited 4. good luck
3. when i got birth control they said 7 days but i've also heard it can take up to a month or three to work. i waited the 7 days and now i'm at the end of my 3rd month of bc and everything's good.
4. my doctor told me go through one whole pack before it was safe...
5. It varies depending on th ebrand of pill you have, if you read the leaflet inside the pack it shoudl explain how long to wait.
6. ive heard that its not "99% effective" till its been in your system a couple months... but this would be something to ask your doctor to make sure
7. Depends on the brand of birth control you're taking. Your best bet would be to do a search on the web and find the pills website. That would give you a more accurate time table.
8. This might be a good place for reference http://sexlife.enjoymeds.com/