Susten 300 is a progesterone medication, and it is quite common for a withdrawal bleed to take up to 7 to 14 days to start after finishing the course. Since your pregnancy test is negative, this delay is likely just your body taking a little extra time to respond to the hormonal changes. I recommend waiting a few more days. If your period does not start within 14 days of stopping the medication, please reach out to your gynecologist for a simple evaluation.
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Why hasn't my period started 10 days after taking Susten 300 for 5 days, even though my pregnancy test is negative?