No. It's impossible to tell if someone has had sex just by looking at them. Doctors can make assumptions but they cannot tell or prove a woman has had sex by looking at her vagina.
If that were the case, my doctors would have believed me when I said I was a virgin when I was given my first pap smear at 18 and again when I had my second one at age 21.
Girls' hymens break by things as simple as playing as a child, riding a horse, etc.
They can tell, but maybe you should tell your family first before the doc says anything, how old are you that they would have an issue?