Weight gain after pregnancy termination.

Hi, I'm 36 year old female having an eight years daughter. On February 1 2017, I went through second pregnancy termination after Dr. found no cardiac activity in the fetus. It was a 12 week pregnancy. Since that date I'm observing continuous weight gain. At the time of pregnancy termination it was 64 which today is 69. I'm little bit worried because as far as my diet is concern, I'm not taking diet or something due to which the increase in weight happen, infact the diet has reduced after termination. All my clinical tests are negative while I've D3 and B12 deficiency and for which Dr. has prescribed me medicine. My gynaecologist has adviced me to cut the sugar intake and to stop carbohydrates intake, which I'm doing since than, even though it is not decreasing infact it is increasing continuously. Please advice me what should I do, is anything wrong with me? Thanks