Talk to Gynecologist on Gynecologist And Obstetrics

as salaam o alaikum . I m married mother of a years boy. before my first baby I had a miscarriage . now I m pregnant again and it's my 31 week . my sugar levels seems little disturb ( 102 fasting and 136 random at 14 weeks) and having low lying placenta . I also have urine problem as I feel like urinating and urine do not pass . for this Dr prescribed me LIAN syrup. I have two questions: 1) can I observe fast in such conditions ?? is it harmful for baby at this stage ?? 2) I fast for 3 days and then feel upset stomach and leg pain . is it due to dehydration?? I m taking gaviscon and ORS . should I fast or leave it completely or fast on alternate days?? PS. attached are my last scan reports and current blood sugar levels ( taken on glucometer )