Plan b taken beginning of month. a week late for period and feel bloated? pregnancy test was negative but no period received

Plan B: May be side effect of 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 or abdominal discomfort. Take another home pregnancy test & notify your GYN if your period is 7 or > days late.