During the first 1 to 3 months of pregnancy, it is important to maintain a healthy and balanced diet that provides the necessary nutrients for the growth and development of the fetus. Here are some general guidelines and food recommendations based on the search results:

General Guidelines:

• Focus on whole foods that provide higher amounts of protein, vitamins and minerals, healthy types of fat, complex carbohydrates, fiber, and fluids.
• Choose foods that are rich in folate, vitamin B6, calcium, iodine, choline, omega-3 fatty acids, and vitamin C.
• Avoid foods that may be harmful to the fetus, such as alcohol, caffeine, and some fish and cheeses.

Food Recommendations:

• Dairy products, such as milk, cheese, and yogurt, are good sources of calcium, vitamins, and healthy fat.
• Foods that are rich in folate include leafy, dark green vegetables, citrus fruits, and dried beans.
• Foods that are rich in vitamin B6 include nuts, salmon fish, peanut butter, and bananas.
• Fruits are a constant inclusion in the pregnancy diet, and fiber-rich fruits are ideal.
• White meat like chicken is safe during the first month of pregnancy, but it is wise to avoid red meats like pork.
• Plant-based sources of protein include plant-based protein powders, tofu, soy products, beans, lentils, and legumes.
• Omega-3s are present in seafood, such as salmon, sardines, and anchovies, but it is best to avoid high-mercury fish like swordfish and shark.
• Flaxseed (ground or as oil) is also a good source of omega-3s.
• It is important to drink plenty of fluids and limit calories from added sugars and saturated fats.

It is important to note that every pregnancy is different, and it is best to consult with a healthcare provider for personalized recommendations and to ensure that any necessary supplements are taken.