I Am A 18 Year Old Male That Workouts A

i am a 18 year old male that workouts a lot ( 6 days a week for atleast an hour 30) and within the last week my right pec has felt heavier and my nipple is kinda hurting but not a lot. I am dropping a lot of fat right now, and can tell the difference between my right and left its not a drastic difference but one side just feels fatter. is this Gynecomastia or is it just my right side just not losing fat as fast as my left?