The normal size of the gestational sac at 5 weeks of pregnancy is about 7 millimeters.
Sperm and egg meet in a woman’s fallopian tube and combine to form a fertilized egg. The fertilized egg will grow and develop to form the gestational sac only after it has been successfully deposited in the uterus. Therefore, when you have an ultrasound at 5 weeks of pregnancy, the gestational sac is relatively small, probably only about 7 millimeters.
It is recommended to do vaginal ultrasound, no need to hold urine, the image is clearer, you can determine the early pregnancy in the uterus as early as possible or rule out the case of ectopic pregnancy.
If the gestational sac is very small in the 5th week of pregnancy, not very clear to see, may be less than 7 millimeters, consider with the woman’s menstrual cycle days are more related to, for example, irregular menstrual cycle, more than 40 days at a time.
If the gestational sac is obviously smaller than the normal size standard, you can review the ultrasound after one week, and the professional obstetrician and gynecologist will clearly analyze and diagnose the situation.