1.Pre-conception examination 2.If you are not pregnant in three months, perform ultrasound follicle monitoring and ultrasound tubal imaging 3.If you are pregnant by cesarean section, ultrasound must be done after 5 weeks of menstruation to understand the location of the gestation. 4.Ultrasound should be done at 12 weeks of pregnancy to do an early pregnancy Down’s screening 5.At 15-21 weeks of pregnancy, if you did not do Down’s screening in early pregnancy, you must make up for it during this period. 6. screening for diabetes mellitus at 28 weeks 7. ultrasound system examination at about 22 weeks 8. routine ultrasound examination at about 32 weeks 9. routine ultrasound examination at about 37 weeks 10. regular obstetric examination.