I have recently changed my gynacologist n she uses the intravaginal ultrasound for every checkup...Is that ok coz im not comfortable with it...And how can I b sure it is well disinfected?

Why the ultrasound? Is there a particular reason that your gyn is doing an ultrasound exam? Is he following a cyst or other abnormality? There is no reason to do routine pelvic ultrasounds on a patient who is asymptomatic. The vaginal ultrasound probe is always disinfected after every patient. If you are unsure, ask the physician or nurse to show you the area where they sterilize the probe.