How do you make sure you're eating enough or right while pregnant?

Just eat normally, avoid raw food, high mercury seafood, avoid alcohol and caffeine, minimise fast food and processed food. Eat more vegetables, protein, drink milk or soy milk, cut down on sugar intake. That being said, I do still eat fast food once in awhile, ate sushi/sashimi during my second and third trimester, drank bubble tea once in awhile too. For me, I'm more cautious during the first trimester. I had no GD, no complications, baby was born at 40 weeks, 3.1kg, no jaundice. I guess just relax and enjoy your food.