Hi and welcome to HCM If their was no penetrative sex then chances of pregnancy is very less and also you have taken i pill within 72 hours, which further reduces the chances of pregnancy pregnancy (provided you were not sexually active without protection after taking it). Since the pills contain high doses of hormones, these can disrupt the normal hormonal and period pattern causing period/bleeding abnormalities and appearance of new symptoms. Wait and watch for your next periods which can be delayed. Look out for development of any other new symptoms. If pregnancy is suspected, or if you miss your periods, or if you have abnormal periods, consider visiting your doctor/gynecologist at the earliest for thorough examination If pregnancy gets ruled out and if you are not ready for pregnancy, but intend to remain sexually active, you should consider getting started on suitable regular birth control measures to be protected (after periods). Be regular with birth control use as instructed. Avoid having unprotected sexual contact if you are not ready for pregnancy Their are safe methods of termination of pregnancy, if you become pregnant (which has very less chances ) consult a doctor for the same. Regards DR Santosh