Brief Answer:
There is a chance of pregnancy.

Detailed Answer:
Hello dear and Welcome to ‘Ask A Doctor’ service.
I have reviewed your query and here is my advice.

You should not rely on birth control pills if they have past the expiry date.

So, there is a chance of pregnancy.

Even though the chances are very low based on the fact that the intercourse was the day after the birth control expired.

I recommend to do a urine pregnancy test one week or two weeks after the intercourse.

Hope I have answered your query.
Let me know if I can assist you further.

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