I waver between not wanting an ultrasound (fewer are better, less possible interferance) and wanting to know how close it has implanted to the fibroid.

I think when you have had infertility troubles it is just standard for REs to do -- especially if one had undergone fertility treatments (which we did not other than naturopathic and acupuncture care).
quote:

From the FDA site:
Certain tests are routinely done to check the well-being of the fetus during pregnancy and labor. The most common of these, ultrasound, uses sound waves that bounce off internal organs to project images of the organs and the fetus on scanners. There have been no reports of harmful effects associated with ultrasound, which has been used for more than 20 years. Ultrasound does not use radiation, drugs, dyes or chemicals and is beneficial in providing valuable information. For example, it can reveal the number of fetuses and age, size, fetal position, some birth defects, and other information vital to the health care of the pregnant woman and her baby.

There are three types of ultrasound, each used during pregnancy for different purposes. The most common is real-time ultrasound, which takes still pictures in rapid succession and detects the heart-beat, placenta, movement of the arms and legs, and the number and position of the fetus(es).

The second is the Doppler ultrasound, used before and during labor to provide electrical signals that are converted to audible signals of the fetal heartbeat.

The third, vaginal ultrasound, can help diagnose the cause of bleeding and pain or an ectopic pregnancy, in which the fertilized egg grows outside the uterus. It can also detect some birth defects early in the pregnancy.

Also, FYI the FDA advises against keepsake 3-D ultrasound images

I've also heard less is better but it is hard since we have technology available now that can help us understand more what is happening to us when we are pregnant.