After the third vaccination, you can prepare for pregnancy normally, and there is usually no definite effect. The main components of the vaccine are inactivated New Coronavirus, recombinant proteins, adenovirus vectors, mRNA, etc. These components generally do not have serious effects on organs and tissues such as the uterus, eggs and sperm. At the same time, there are no clinical cases or relevant authoritative literature that can prove that vaccines can affect the preparation for pregnancy and the development of the fetus. Therefore, as long as there is no clear contraindication to vaccination and no serious allergic reaction after vaccination, you can prepare for pregnancy normally after vaccination and pay attention to regular obstetric examination.