You may be right. You have plotted the BPD on the
mean of the curve for growth and this suggests that she is only just a
little more than 12 weeks pregnant.
However, she reports that her periods were regular before she became
pregnant and she is sure of her dates. It is perhaps more likely that her
dates are correct but that the BPD is too small. There may be something
wrong with the pregnancy.
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Incorrect.
All correct areas are highlighted.
Incorrect. You have plotted the chart as if the BPD
measures the correct size for her dates (along the mean for the growth
curve). From your plot, you would expect the BPD to be 39 mm, whereas it
actually only measures 21 mm.
You need to plot the measurement again. A small BPD suggests that
there is something wrong with the baby.