Yes, starting Susten SR 300 (which contains progesterone) on cycle day 15 can indeed delay your period. Progesterone works to support and maintain the lining of your uterus. While you are taking this medication, your hormone levels remain elevated, which typically prevents your period from starting. Usually, menstruation will begin a few days after you stop taking the medication, unless you are pregnant. This is a completely normal and expected effect, so please do not worry. Be sure to follow your doctor's exact guidance on when to stop the medication.
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Does starting Susten SR 300 on cycle day 15 delay the onset of menstruation?