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According to my LMP, I am 8 weeks and 2 days pregnant. However, my USG scan shows that I am only 5 weeks and 6 days pregnant with no cardiac activity or fetal pole visible. They have suggested another scan after 1 week. Is this normal? Why is there a difference between the LMP and scan results? Thank you.

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Artificial Intelligence Health Assistant's Answer

It is not uncommon for there to be a discrepancy between the estimated gestational age based on your last menstrual period (LMP) and the findings of an ultrasound scan. The LMP calculation assumes a regular 28-day menstrual cycle, with ovulation occurring on day

  • However, not all women have regular cycles or ovulate at exactly day

  • Ultrasound scans are considered more accurate in determining gestational age because they measure the size of the fetus directly. In early pregnancy, when cardiac activity and fetal pole are not yet visible, it can be challenging to accurately determine gestational age solely based on ultrasound findings.

    The absence of cardiac activity and fetal pole at this stage does not necessarily indicate a problem. It could simply mean that it is too early in the pregnancy for these structures to be visible yet. This is why your healthcare provider has recommended another scan after one week - to allow enough time for further development.

    It's important to remember that every pregnancy is unique, and variations in growth rates can occur. The timing of conception may also differ from what was initially assumed based on your LMP.

    If you have any concerns or questions about your pregnancy, it's always best to consult with your healthcare provider who can provide personalized guidance based on your specific situation.

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