U can take 4 tab low dose oral contraceptive pill containing ethinyl estradiol n levonorgestral n repeat after 24 hr.called asThe Yuzpe Regimen . It is a method of emergency contraception using a combination of estrogen and progestogenhormones (100 μg ethinylestradiol and 0.5 mg of levonorgestrel as soon as possible and again in 12 hrs) and started within 72 hours of sexual intercourse. But it leads to nausea vomiting gastritis. Best to take any medication only after consulting gynecologist. Or u can consult me thru paid online consultation  so tht medicine can b prescribed well for associated nausea n all