If the usual menstrual cycle is regular pregnancy 5 weeks 2 days through the vaginal ultrasound can see the pregnancy sac, abdominal ultrasound may not see, but there are individual differences. In general, women with regular menstrual cycles can see the gestational sac through vaginal ultrasound at about 5 weeks of pregnancy to determine intrauterine pregnancy. Through the abdominal ultrasound examination may not be able to see the pregnancy sac, abdominal ultrasound examination is about a week later, about 6 weeks pregnant can see the pregnancy sac. However, it is not absolute, some women’s menstrual cycle irregular ovulation delay, fertilized egg implantation late, may be pregnant about 5 weeks vaginal ultrasound examination can not see the gestational sac. After pregnancy to do a good job of pregnancy check, it is best to wait until 6 weeks after menopause and then go to the hospital to do ultrasound, because the pregnancy 5 weeks time is relatively short, the gestational sac is small, due to personal or machine reasons may not see the gestational sac, easy to cause the pregnant woman panic psychology, the vast majority of pregnancy 6 weeks can be seen. If you can’t check the gestational sac, you should combine the blood HCG to clarify whether ectopic pregnancy is possible.