Are you noticing just puffiness or are you getting some tenderness as well? I've always had puffiness behind my nips because I store fat there. When I'm eating on a calorie surplus, it gets a little worse. Now, I recently had a gyno flare-up while taking Trenavar and it's WAY different than a little puffiness. My nips were sore to the touch. Not the surface of them, but under the skin. AND I can even feeling the swelling/nodules behind them. You might just be having a little fat gain while on cycle. I mean, it never hurts to play it on the safe side. But from my experience gyno is WAY more than just a little puffiness.