Thanks for the query.
If you had taken an emergency contraceptive pill following intercourse, then you should have ideally resumed your withdrawal bleeding within 7-10 day. but as you have crossed that period without any menses, then it is important to rule out pregnancy in this case as it may be a case of failed emergency contraception.
You may perform a serum beta hCG test which is the gold standard for confirming or ruling put pregnancy for sure.
I hope I have answered your query.
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