Hi, Susten can be taken preferably vaginally. It is a progestogen and helps to prepare the endometrium in a better way to receive the conceptus and in case of any natural progesterone deficiency, helps to maintain the pregnancy. You can wait for your normal period to occur and if you miss it, go for a pregnancy test 3-7 days later with a fresh early morning sample of urine. Hope your query is answered. Good luck.