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Switching birth control pills: can I get pregnant?

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I recently switched bc pills from Orthonovum 1/35 to Yasmin, and I had sex within the first 7 days of my first pack of Yasmin (I started the day after my inactive Orthonovum pills just like I would've started any new pack). Could I be pregnant? I am now on the 4th day of inactive pills where I am supposed to get my period, but I haven't gotten it yet. Could this mean I am possibly pregnant or is it just because I switched pills?

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replied April 23rd, 2007
Birth Control Answer A2618
The only way you can find out if you are pregnant or not is to take a pregnancy test. Switching contraceptive pills shouldn’t decrease the pill's efficiency. However, antibiotics may interact with the contraceptive pills and decrease their efficiency.
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