Excessive weight gain

Hi, I’m in my 3rd trimester (29w3d) and I have already gained almost 15kg... my gynae says she’s not concern about it and I can afford to gain more because I’m considered petite in size (1.57m and 51.5kg before pregnancy). But I can’t help but to feel anxious about the excessive weight gain. Esp when people around me are commenting on my pregnant size... is 15kg at 29weeks really normal? Recently got tested negative for GD and my baby is almost 1.6kg at the moment.