Can dating ultrasound be wrong

5 ½ weeks gestation means 5 ½ weeks from the first day of the last menstrual period, which is usually about 3 ½ weeks from the date of conception (confusing, isn’t it!) the fetus is clearly seen on trans-vaginal ultrasound and the heart beat can be seen at this early stage (90 to 110 beats per minute under 6 to 7 weeks, then 110 to 200 beats per minute as the baby matures).I went to my first prenatal visit, and I would have been 15 weeks based on my LMP.However, the doctor did my exam and said I didn't feel pregnant.I questioned it but when the ultrasound tech said I was measuring on time I let it go. After much reading I’ve learned that that can cause a fetus to not show up until 10-11 weeks, which is when I first saw my baby according to the due date I believe I really have.

Also the fetus cannot bend and twist too much yet, so the length of the body is fairly constant.Most dating scans are done with a trans-abdominal transducer and a fullish bladder.If the pregnancy is very early the gestation sac and fetus will not be big enough to see, so the transvaginal approach will give better pictures.Will they change my due date when they do my next one in a few days (will be supposedly 19 weeks then)? So yes, I think an ultrasound could be wrong although probably not often.I do not believe ultrasounds are an exact date either.

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My baby and belly have been measuring 3 weeks ahead nearly my entire pregnancy.

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