I can tell you that orthodontics during pregnancy usually does not have a direct negative impact on the fetus. However, there are several factors to consider:

1. Drug use: During orthodontic treatment, some drugs, such as X-ray contrast agent or local anesthetic, may be needed. The use of these drugs should be carried out under the guidance of a doctor and should be avoided as far as possible in the early pregnancy.

2. Gingivitis and infection: During pregnancy, gums may be more susceptible to infection and inflammation due to changes in hormone levels. This may cause discomfort and pain during orthodontics. Therefore, it is very important to maintain good oral hygiene, including brushing teeth, flossing and visiting the dentist regularly.

3. Nutrition intake: During pregnancy, good nutrition intake is very important for fetal development. If orthodontics causes difficulty in chewing or restricted eating, it may affect your nutritional intake. In this case, you should discuss with your doctor and seek a suitable solution.

Generally speaking, if you plan to get pregnant or are pregnant, it is best to consult a professional dentist and obstetrician before starting orthodontics. They can assess the risk according to your specific situation and provide you with the best advice and treatment. Remember, maintaining good oral hygiene and a balanced diet is very important for your health and that of your fetus.