How long does it take for ectopic pregnancy to cause bleeding?

Patient's question:

No

Doctor's answer:

Generally, before seeing a gestational sac on ultrasound, hCG can be used for preliminary judgment, or a transvaginal ultrasound can be performed to check if there is a gestational sac in the uterine cavity. It is not limited to how many days of missed period. Blood hCG tests for ectopic pregnancy may be lower than the levels of normal intrauterine pregnancy.