A member asked:

At 6w2d i took a cb weeks estimator and it shows 2-3. i've seen a gs & ys at us at 5w4d. r these hpt reliable & accurate and should i be concerned?

A doctor has provided 1 answer
Dr. Erinn Huffman answered

Specializes in Obstetrics & Gynecology

No: The cb estimator is looking at how many weeks since you ovulated, and is based on the level of HCG in your urine. The levels in urine give a basic idea that you are pregnant, but aren't precise enough to calcuate actual weeks. (unlike what their packaging states) the us actually measures the fetus and is the most accurate way to determine youe due date.

Answered 9/28/2016

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