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A member asked:
How long does it for trinessa (norgestimate and ethinyl estradiol) to be effective?
A doctor has provided 1 answer
Day1-5 ok right away: You are protected against pregnancy right away if you take it during the first 5 days after your period starts. So if your period starts on monday, you can start the pill up to friday for instant protection. If you start on day #6 or later, then it takes about a week before you're fully protected & so you should use a back up method (condom, female condom, diaphragm, or sponge) during the 1st week.
Answered 4/29/2017
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