Doctors appointments?

Do you have to make a doctors appointment to get a ultrasound done on your ovaries? I was told a while back that I had ovarian cyst, I never been back but I do need to go back and get it checked out to see if it is still there. The kast place I went to was very rude and unprofessional the lady for one didn’t wanna look down there, I kept telling her it hurt and she said “do you wanna do this or not because you don’t have to” she kept jabbing it in my butt then she made me do it myself. I started bleeding and she goes “oh your bleeding” I wasn’t even being dramatic she just seemed bitchy. Then had the nerve to ask me to rate the damn visit she sure did get a 0 from me. Anywho, I’m trying to go to this new place not so far from here I live maybe 30 min and I was gonna do a walk in but idk if they will just let you walk in and ask for an ultrasound. do I have to call and make appointments for that type of thing?