After 10 days of missed period, how long does it take for the pregnancy to enter the uterus?

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Hello doctor. I'm 10 days late for my period, the pregnancy test showed 2 lines, but the ultrasound did not see the gestational sac in the uterus. The doctor asked me: 10 days after my period, how long does it take for the fetus to enter the uterus? Ask your doctor for advice. I would like to thank you.
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Hello.
With the question: "After 10 days of delay, how long does it take for the fetus to enter the uterus?" Vinmec would like to advise as follows:
Usually, the fetus is seen on ultrasound around the 5th week of pregnancy or when the HCG level reaches 1100. Before this time, the ultrasound did not show the sac. fetus in the mother's uterus.
Therefore, to confirm you are pregnant and rule out the possibility of an ectopic pregnancy, you should test your Beta HCG level/blood and go back to your doctor after 1 week. If you have symptoms such as fatigue, abdominal pain, abnormal vaginal bleeding, you need to see a doctor immediately.
You can go to the Obstetrics and Gynecology department at a reputable medical facility or one of the Vinmec Health System hospitals nationwide to get more detailed advice from experienced doctors.
Thank you for trusting and sending questions to Vinmec. Looking forward to meeting you to discuss and examine the current issue. Best regards!