Weight gain 6 weeks post D&C

Just wondering if anyone else out there experienced weight gain following a D&C. I also feel like I'm retaining a lot of water. I'm currently 5-8lbs heavier than I normally would be with eating the exact same as I did prior to becoming pregnant. Did anyone have success with losing the weight/excess water with a certain diet/exercise routine?!? It is making me feel so sad that this is happening upon very thing else. :( I eat fairly healthy and I am active throughout the day.