Well it really depends on your dosages, cycle history and proneness to sides, in your case gyno. If you have an AI on hand you can start at .25mg/day and ramp up accordingly. Its very potent, so doses of 0.5 to 1 mg are enough. Some claim that 0.25 mg is enough, but for anyone doing any sort of...
True, it could very well be the infamous test flu, check if it subsides in a couple days, if the spot turns warm to the touch you might want to go see a doc.