If I remember, nandrolone by virtue of its structure has some progestagenic actions (some OC progesterones are 19-nor derived) but do NOT possess the anabolic or androgenic actions of nandrolone because of their chemical modifications. Nandrolone aromatizes to primarily estrone, not estradiol.
Progesterones cause weight gain because of their effects on appetite. This is why they were used for HIV related wasting early on.
Estrogen is the fat repartitioning agent, although P, esp the 19-nor derived types may cause water retention.
W6