At 4 months pregnant, is it still necessary to have an ultrasound if it's normal?

Patient's question:

Actually, I really want to have an ultrasound, but I'm not sure if it's necessary.
Because I just finished treating the herpes virus before getting pregnant, but I'm also afraid of a recurrence affecting the fetus, so I have a lot of concerns. I always feel at ease only after having an ultrasound.

Doctor's answer:

A check-up at 5.5 months of pregnancy revealed a fetal biparietal diameter of 4.7 cm and a femur length of 3.3 cm. This should be considered consistent with the expected gestational age of 5.5 months, and the fetal development appears to be normal. The amniotic fluid index was 19.7 cm, which should be considered as being on the higher side. The fetal heart rate was normal. It is recommended to control fluid intake promptly and consider monitoring blood sugar and blood pressure to rule out the possibility of gestational diabetes or preeclampsia.

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