During the first month of pregnancy, it is important to ensure you are getting the necessary nutrients for a healthy pregnancy. One key supplement to consider is folic acid, which helps prevent birth defects. It is recommended to take 400-800 micrograms of folic acid daily before and during early pregnancy. Additionally, other essential nutrients like iron, calcium, and vitamin D may also be beneficial. However, it's always best to consult with your healthcare provider for personalized advice based on your specific needs and medical history. They can guide you on the appropriate dosage and any additional supplements that may be necessary for a healthy pregnancy.