Hello, I have gone through your query and understood the concern. To postpone a menstrual period, the dosage of progesterone should be sufficient. If you used the same dosage and for the same duration as earlier but still experienced spotting, this is possibly due to lowered inherent hormone availability which can happen with sudden weight changes, stress, infections, use of certain medications and cysts of the ovary. Please inform your health care provider to get the appropriate correction needed. Take care.