Hi and welcome to HCM
If you have taken the emergency
contraceptive (unwanted 72) within 48-72 hours of the unprotected sexual intercourse, it should work in preventing
pregnancy (provided you were not sexually active without protection after taking it). But do remember effectiveness of this pill reduces as time of taking this pill increases after having unprotected sex.
Since the pills contain high doses of hormones, these can disrupt the normal
hormonal and period pattern causing period/bleeding abnormalities, delayed periods and appearance of new symptoms.
Look out for development of any other new symptoms. If pregnancy is suspected, or if you miss your periods as in your case it is delayed, consider visiting your doctor/gynecologist at the earliest for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum
HCG level test (to confirm/rule out pregnancy accurately).
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
Emergency pills are not safe and i wont suggest any of my patients unless it is necessary
Regards
Dr Santosh