Took plan b 8 days ago and have had some bloating/weight gain. is this a side effect and when would i go back down to my normal weight with reduced bloating?

Weight should drop: back down again. 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, bloating or feeling tired. If you develop chest tightness, difficulty breathing, swelling of lips, mouth, throat – call 911.