Can a pregnancy be missed during an vaginal ultrasound?

Anything is possible, I think if you were going in for a vaginal ultrasound they may not have been LOOKING for pregnancy, if they did see it, it wouldnt be their duty to tell you, get me??? Like When i was pregnant with my son i didnt know and i have a history of gall stones, they took me to the hospital and had an ultrasound done, by that time i was 2 months along already and they didnt tell me anything, usually when you have a US done for a certain reason they wont look for pregnancy unless you specificlly ask. Good Luck :)