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I will share my little method, but remember--especially when one is pregnant--doctor's advice and orders trump anything one reads on the Internet.
My method is oatmeal. Fortunately, I have always been blessed with the company of understanding folks when pregnant. So I ate oatmeal every few hours in addition to my regular meals. The most important servings of oatmeal are midnight and four a.m., in order to prevent or to lessen low blood sugar. I usually arise at about seven a.m., and when I was pregnant, I ate a protein meal immediately upon arising.
I hope that my little woman-to-woman ideas have helped.