The chance of misdiagnosis of ectopic pregnancy is small. In general, if you want to accurately determine ectopic pregnancy, you should have a blood test for HCG. When your period is delayed for about 10 days, the value of HCG will double when you have a blood test every other day, and this is the time when you can accurately determine that you are pregnant. However, during this period it is possible that the ultrasound cannot check the location of the gestational sac because it is too early and the sac is too small to be seen accurately, so it is important to pay attention to it through the clinical symptoms of the individual. If there is no severe stomach pain or vaginal bleeding, there is no need for special treatment, so try to take rest and not to exercise strenuously. If you have severe stomach pain or irregular vaginal bleeding during this period, you can have a vaginal ultrasound or abdominal ultrasound to accurately determine the location of the gestational sac, so that you can accurately determine whether it is an ectopic pregnancy.