15 days before period, unprotected sex, emergency pill 3 hrs later. 3 days later sore breasts, extra tired & nauseous. is this the effect of the pill?

Likely side effect: Potential Side effects w emergency contraception: tender breasts; menstrual flow changes (spotting, bleeding, early or late period); loose stools; dizziness; headache; nausea/ vomiting; abdominal pain / cramping or fatigue. For chest tightness, difficulty breathing, swelling of lips, mouth, throat – call 911. Take pregnancy test & notify Dr if your period is 7 or > days late.