I am 8th month pregnant my LMP date is 28th

Patient: I am 8th month pregnant my LMP date is 28th sept 2014..but m nt gaining weight and doc is also confused about my EDD. In ultrasound it is 16july as doc saod its 5th july but she still told me that today its my 28th week.how come and will u please solve my all queries as m very nervous and tensed about it.

Doctor: