Weight gain

I’m in my early twenties and this is my first pregnancy, I have always been very small weighing only 108 before getting pregnant. I am at 16 weeks and have gained about 5 lbs so far which is no issue it’s a pretty healthy weight gain, but I have noticed that my face and neck is getting fat. Do any of y’all have any suggestions or recommendations on how to Avoid from gaining anymore weight to my face and neck?