Need advice on X-rays if there is a possibility I'm pregnant

I was in a car accident recently and am scheduled to go see a chiropractor this Friday for the first time. I know they do X-rays for an initial exam. My concern is I don't know if I could be pregnant yet. My period is due the 20th, so it would be really early if I were. Does anyone know if it would be harmful if I found out after the fact that I was pregnant? Not sure what to do 😔