Monthly and weight gain

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I've had a tough week. My weight fluctuated more this week than it has since I started my journey. I've had a partial hysterectomy so I still go through the hormonal changes. This month I've been very crampy, more than I have had in a long time. I was wondering if I will still retain water and if that may be a reason why for my weight fluctuation. I have also started lifting weights at least twice a week.