Well, the fries and cheeseburgers are not doing you any favors. In fact, those particular fats (saturated, trans) are possibly the worst thing you can be putting in your body right now.
When I was preggers in ancient times (40 years ago), all the doctors I knew of recommended no more than 20-25 pounds gained during pregnancy, and strongly counseled mothers-to-be to eat carefully and exercise regularly (at least walk daily). This made the pregnancy and delivery easier, and recovery /weight loss after the baby came were less daunting.
There are apparently fewer concerns today about large weight gains, but I don't know why this would be, unless doctors are simply throwing up their hands in the face of 'modern' eating habits. I see so many younger women never getting rid of that baby weight, and putting on more with each pregnancy.
Choosing foods with high nutritional value, plenty of fiber, and good fats and filling up on those FIRST will probably alleviate your craving for the 'easy' fats and flavors. This has always been, and will probably always be, one of the best strategies for eating well and controlling weight. And it's so important for your long-term health, and the health of your children. Achieving that will probably require that you do more cooking from scratch, more planning ahead, and less letting meals slide until you just HAVE to have something quick, so you opt for less-wholesome alternatives.
I know what I'm suggesting isn't easy, especially if you have fallen into the habit of getting instant gratification from quick foods. But I have been extremely careful with my food habits, exercise and weight all my life, and I can tell you that aging/menopause take their toll regardless. I developed diabetes at age 55 because I'm genetically susceptible. Eight years later, I'm overweight but still controlling my blood sugar through diet and exercise. My doctor says this is unusual, and is convinced that if I ate a more 'typical' modern diet, I would have been diabetic years earlier and on insulin by the age of 55.
Food choices matter, not only for your younger years, but as you age, too. What you are eating now could show up in your health profile in another 15-30 years. And what a pregnant woman eats also affects the health profile of her children and their children. Science is making amazing discoveries about this – there's an 'epigenetic' effect that means your food choices are changing right now how your baby will handle fats, and will pass that change on to future generations.
I sure do wish you the best.