The pregnancy stick shows pregnancy B ultrasound can not see, and a variety of factors: 1, consider the current menopause time is relatively short, although the pregnancy stick has prompted pregnancy, but the gestational sac has not formed, this time the ultrasound can not see the gestational sac echoes, generally in the pregnancy of 40-45 days of ultrasound can be carried out, the normal situation can be seen in the gestational sac echoes. 2, anomalous pregnancies, such as ectopic or biochemical pregnancies, if the B ultrasound has not been seen inside the echo, accompanied by bleeding, abdominal pain, need to beware of the occurrence of anomalies. If you can’t see the echoes of the gestational sac in the ultrasound, accompanied by bleeding and abdominal pain, you need to beware of the occurrence of abnormal pregnancy. Combined with the blood HCG examination, observe the doubling of the value of the situation, the later need to follow up the ultrasound, comprehensive analysis, a clear diagnosis, and then consider targeted symptomatic treatment.