Thank you for writing to us.
In fetuses, the LMP and the Ultasound dates always vary by a little bit. The LMP dating is calculated by taking the last known period date till the present date.
The ultrasound calculates the size of the fetus. Based on the size, the fetuses age can be decided. Usually, there is a slight difference and this can be from 2 to 4 weeks. Since the difference only varies by 1 week, you need not worry.
To allay your fears, please talk to a Gynecologist if needed. All the best.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.