It is a very bad idea to severely restrict calories, nutrition and starve oneself. whilst pregnant from a genetic point of view. You baby will grow and even be born health, but this doesn't mean their epigenome will and chances are there will be a predisposition to obesity later in their life as it was famously demonstrated with the Dutch Famine epigenetics studies
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Now is the time to think long term for both you and baby. Put nutrition first. Avoid high fat food/diets as they have been proven to negatively affect baby's brain neurodevelopment. Increase drastically your intake of vegetables and fibre, avoid processed food including processed meats (ham, bacon, sausages, burgers, ....) . Eat for body and brain, for bite of you. Focus on whole grain, so no white bread, white pasta, white rice, have at least three meals based on pulses, so one meal will be red lentils, one chickpeas, one cannelloni beans.
You need to make changes that are life long so that your household will have a healthy diet when baby is born and later when baby is weaned.
Eat a normal amount of calories, on the low but not starving side, not the high amount you are eating now and make every single one of these calories count. Every morsel has a purpose. Eliminate the rubbish, the junk, the snacking, have your three meals, and if you absolutely need a snack, have a piece of fruit, a different one every day. An apple on Monday, a pear on Tuesday....
Keep in mind that your metabolic need of calories is to maintain body systems' function and metabolism, your excess fat has no metabolic requirement, so whenever calculating your calories need, don't use your current weight, but an adjusted weight. Most TDEE calculator online are absolutely rubbish.
Maternal nutrition matters what more than most people think.