Is it possible?

Is it possible to have a natural birth with a potentially small pelvic bone? I haven’t been told that I have one but I feel like i do being so petite. I’m hoping for a water birth though. I had a well women exam and the speculum didn’t fit. Is there anything I can do to have a baby naturally with small pelvic bones? I’m about 5’1 150 ish, and I have big hips but idk if that helps anything.