I Am 6 Months Post Medical Termination And Currently Taking

I am 6 months post medical termination and currently taking 50mg of Desvenlafaxine daily. Despite eating healthily and moderately exercising I have put on 6kg and cannot seem to shift it, but continually gain more weight. I am feeling very down about my weight and don't know if it's due to the termination or the medication which I have also been on for 7 months.