i had my last period on 4th may. since then i didnt had my periods.a week before my doctor has advised to deviry for 5 days but i dint had periods and now she has advised me susten 300 for 5 days. can u please tell me for wat purpose susten is advised. I am married but not planning for pregnancy.and there is a chance of getting pregnant. i had sex on 21st of may.