I am 20 weeks pregnant and am a housekeeper for a living. I practice safe moving techniques when doing my work. Lately, my lower back has been in some extreme pain for the past three or four days. It's near my tailbone and it hurts to lay flat on my back or sit in a few positions and sometimes it just clicks when I walk along with my hips. I do not want to risk radiation exposure during pregnancy. What are my other options to see what could be causing my back to click along with the pain?