Hi Some important information is lacking in your notes like when was your last period and regularity of periods. If you have had sex in the first week of your mensus or in the last week of your menstrual cycle then you are in the safe period and pregnancy will not occur. If the day you had unprotected sex doesn t fall within this period then there are chances that you might get pregnant. Since it is already 72 hours since you had sex you cannot use Plan B emergency contraception to avoid pregnancy. Intrauterine contraceptive devise inserted within 5 days of ovulation also works as emergency contraception. In addition it is a reliable contraceptive method which you can continue. Do consult your Gynecologist Gynaecosid is not an emergency contraceptive pill. It is used to start withdrawal bleeding in conditions of amenorrhea not due to pregnancy. I hope I have answered to your satisfaction.