Regestrone (which contains norethisterone) is typically started three days before your expected period if your goal is to delay it. Starting it four days after your expected date is usually not effective for delaying that cycle, as the hormonal shift has already occurred. First, please take a home pregnancy test to rule out pregnancy, which is a common reason for a delayed period. If the test is negative, I gently advise consulting your doctor.
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Can I take Regestrone tablets four days after my expected period start date?