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You have not mentioned which day of your cycle you had unprotected sex and also not mentioned regularity of your cycles. Since you took Emergency contraception
pill within 72 hours, less chance of pregnancy
. Your periods will get delayed and you may experience heavy bleeding when it starts. Also weight gain, breast pain
, abdominal pain
, nausea are side effects of Emergency contraceptive pill
. It is better to get Pregnancy test if it is very late. If negative test it could be due to hormonal disturbance for which Gynaecologist consult is necessary. Next time use condom to prevent pregnancy and prevent STDs.