Hello Priti thanks for your query. Both susten and microgest are forms of progesterone. Both are given in early pregnancy , for luteal phase support, if the doctor feels the need. There might be risk factors like previous miscarriages, delayed growth of present baby, history of polycystic ovarian disease, threatened pains or any risk for miscarriage detected by the doctor on pelvic examination or on ultrasound. These are safe drugs, if given for proper indication, and you should consult your prescribing doctor for elaboration on why they were given to you. Please do not worry about it, as you have taken only one dose of each, and these are routinely given in high risk patients for pregnancy support. Take care