Yes, Susten 200 SR (which contains progesterone) can absolutely cause your period to be delayed, as it naturally supports your uterine lining. Regarding pregnancy, while a negative test on day 27 is very reassuring, there is still a small chance of pregnancy if ovulation occurred later in your cycle than usual. I recommend waiting a few days and testing again with first-morning urine if your period does not start, or contacting your doctor for a definitive blood test.
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Can Susten 200 SR cause my period to be delayed, or could I still be pregnant even though I tested negative on day 27 of my usual 28-day cycle?