Will i miss my period sinse i took plan b , without this months period coming yet ? and what side effects are from plan b

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.