Weight after baby

I have struggled so much with keeping weight on. After my first daughter was born I came home on 115 lbs and when I got pregnant with baby #2 I was 97. I am currently only 126 lbs and almost 36 weeks. I absolutely HATE being so skinny . any moms know of any way a or supplements that help keep on weight ? Or diets ? I enjoy the size I am now even with this big belly.