Took plan b 4 days before my expected period out of paranoia after protected sex with a condom. will the pill effect my period, what should i expect?

Plan B: Potential SE’s w emergency contraception: tender breasts; changes in menstrual flow (spotting, bleeding, early or late period or spotting instead of period); loose stools; dizziness; headache; nausea/ vomiting; abdominal discomfort or feeling tired. If you develop chest tightness, difficulty breathing, swelling of lips, mouth, throat – call 911. Notify your GYN if your period is 7 or > days late.