Why are u on susten if not
pregnant. Susten is a progesterone supplement given to support an early pregnancy. If your UPT is negative, the chances of pregnancy are low, but you may repeat in a week again. If you are really anxious to know your status u can go for b-Hcg level blood test. Susten does not cause irregular periods
Next Steps
REPEAT UPT IN 7 days or serum BHCG blood test
Health Tips
Your periods may simply be delayed, wait it out