If it's important for your well-being, you can still colour your hair during pregnancy. However, it is important to know that the products hairdressers use for dying and highlighting hair, as well as for doing perms, contain strong chemicals. All products sold in German drugstores or used in hairdressing salons are officially considered harmless when used correctly. It is certain, however, that many chemical components can enter the body through the scalp. Therefore, it is best to wait until after the first twelve weeks of pregnancy before dyeing your hair. The embryo is still particularly sensitive during this time. 

If you want to be on the safe side during the second trimester of pregnancy, you can have highlights or streaks done instead of bleaching or dyeing all your hair. Less bleach comes in direct contact with your scalp when you get highlights. Also, since only parts of your hair are treated, smaller amounts of strong chemicals are used. Plant-based dyes are also a good option. If you colour your own hair at home, you should absolutely test the product on a small area of your skin beforehand. This way you can make sure you tolerate the product and that your skin is not allergic. You should even do this test if you want to use a product that you have used before. This is because your skin changes and often becomes more sensitive during pregnancy.