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Emergency contraceptive pills may contain higher doses of the same hormones (estrogens, progestins, or both) found in regular combined oral contraceptive pills
It should be taken within 72 hours of unprotected intercourse
. These drugs are not over the counter drugs and should be taken after prescription.
It will be better if you see OBG specialist before taking those.
Hope I have provided the information you needed.
Wish you good health. Take care.