About twins baby's growth in the womb.

I'm 33 weeks pregnant today. I'm expecting twins and the due date is 1st week of November. Last week (32nd week)  I did my growth scan. In the scan it is found that the growth of fetus 1 is adequate according to the weeks. But fetus 2 is lagging behind by 1 week. As per the scan weight of 1 fetus was 1857 grams which was adequate. And the weight of another fetus was 1630 grams. Doctor said that the growth wise second fetus is running behind the date. Also the abdominal circumference of the fetus 2 is 26.2 CM which is according to the 30th week. But I did my scan at 32nd week. My doctor was not in the town that day. So his assistant told me to increase my diet and protein intake. And weight will get increased. I need to know if there is any problem with such wright. Is it normal in twin pregnancy?? I'm also facing gestational diabetes but my sugar levels are very much in control. Please assist me.