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Repeat urine pregnancy
test with first morning urine sample in a laboratory or can do beta HCG[blood test] done for confirmation of pregnancy. Do this test after 1 week because in few patients if conception has has occurred late in the cycle then test will be positive 1 week later.If 1 week later pregnancy test is negative then you are not pregnant & you can take medicine for withdrawal bleeding.
I hope this answer is helpful to you.