"Fetal ultrasound imaging provides real-time images of the fetus. Doppler fetal ultrasound heartbeat monitors are hand-held ultrasound devices that let you listen to the heartbeat of the fetus. Both are prescription devices designed to be used by trained health care professionals. They are not intended for over-the-counter (OTC) sale or use, and the FDA strongly discourages their use for creating fetal keepsake images and videos."
(My view: I had many scans (eight) when pregnant with AJ and they were all prescribed and administered by medical staff. No 3D or 4D ultrasounds. The ultrasound images provided information to our medical team, and since I was a worrier they also helped maintain maternal sanity. I never considered getting a commercial ultrasound because we were having so many medical ones, and anyway I don't see the point of having an optional scan. Its only purpose would be to show us what she looked like, and what she looked like was never an issue; we would love and welcome her regardless of looks. Anyway, we knew our baby was and would be beautiful - duh!)
Something to think about.