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That depends on which pill was missed. If it's one among the last 7 day pills, it does not affect your chances. However missing the regular pills used (one that is used regularly for 21 days), there are some chances of pregnancy
You can minimize the chances by taking 2 pill on the subsequent day.
Hence if you have used 2 pills the next day and do not miss your pills again, the chances of pregnancy are minimal.
Hope I have answered your query.
Wish you good health.