only take nolvadex when gyno occurs, different individuals have different sensitivity to gyno. since you are taking proviron then it reduces the chances, 100mg of proviron seems alot to me, I usually use 25-50mg/ED proviron in all my cycles.
yes, proviron is an anti-e.
However, if gyno does occur then take 20-40mg/ED of Nolvadex until gyno or gyno symptoms subside.
peace bro