Welcome to HCM,
Oral contraceptives gives best results if taken regularly and at same time every day.
These pills prevent ovulation. When you miss a dose, your protection decreases.
Now you should avoid unprotected sex during remaining part of cycle.
If your period doesn't start within a week of due date, do pregnancy
test and take action according to report.
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Hope you found my response to your query informative and helpful.
With good wishes,
Dr.Chandra Shekhar Sharma