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Ortho tricyclen lo takes a minimum of a month to be fully effective but you should still be using a condom even if you're on birth control. Pills are easy to miss a day or mess up on and no birth control other than abstinence is 100% effective. There are girls who get pregnant while on the pill AND using a condom so just be smart and lower your chances as much as possible.

I took this pill for quite some time. If I'm not mistaken, the label tells you that it takes seven days for it to really go into effect. I know everyone is different, but I used it and never got pregnant. As a matter of fact, when I stopped taking it to try and get pregnant, it took us three months to get the bun going in the oven. Good luck!

Yes, you need to have it in your system for a month. Have him wear a condom as well as you taking the birthcontrol. Not to mention keeping you from STD's

yes, I heard BC takes up to 3 months for it to be fully effective!