hey bro! im also at the end of my 4th week of 400mgs a week of test cypionate only. i started at 197lbs. and now im at 218 lbs. i can tell you a lot of it is water, not to say the same has to be true for you but dont get too nervous. if most of the bloating is in your stomach then i would guess its mostly water. ive been eating 3400 cals a day and taking them in these percentages: 40% protein, 40% carbs, and 20% fat. and just think now the real gains begin! i also drink 1 gallon of water a day. good luck!