How many days after an ultrasound can you have a second one?

Patient's question:

I found out I was pregnant three days ago and want to check if it's an ectopic pregnancy. How long should I wait to have a second ultrasound?

Doctor's answer:

If your menstrual cycle is usually regular, you can generally use a pregnancy test kit after your period is delayed. It is generally recommended to have a pelvic ultrasound examination around the 40th day of pregnancy. This can confirm whether it is an intrauterine pregnancy. A pelvic ultrasound is a non-invasive examination method. During pregnancy, it is necessary to have regular check-ups. How often you need to have a check-up depends on your specific circumstances.

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