It is highly unlikely that you would be infected with any infections from the vaginal ultrasound probe. Since you had IVF, I assume you are being followed by a board certified obstetrician, and being seen at an accredited hospital. Reputable hospitals, clinics and doctor’s offices follow strict guidelines for washing and sterilizing this type of equipment. Yes, they are sterilized between patients. Usually, new sterilizing agent (usually liquid) is used for each probe, then the probes are rinsed or wiped well. It is doubtful that any chemical would remain on the probe.
I understand your concern about your pregnancy and your desire to protect your baby. Continue to take good care of yourself and keep in touch with your doctor. Good luck!
29. January 2012
anonymous-qa