Hi! Glad you found our forum! Welcome. So, x rays are generally pretty safe during pregnancy. Make sure to tell the X ray tech though so they take necessary precautions. Here's an article on it https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/expert-answers/x-ray-during-pregnancy/faq-20058264. It states that diagnostics is important and would outweigh any small risk.
What are you needing the chest x ray for? Is this your first baby? Are you excited? :>))