Ask your doctor if he will let you take prenatal yoga. I've never gotten x rays but I've had sciatica for several years (it comes & goes) and when I got pregnant it came with a vengeance. Prenatal yoga + walking have been the only things that help me. I'm 17+4 and I joined my class 3 weeks ago... It has done WONDERS. I was going to try acupuncture & a chiropractor if yoga didn't work bc they're covered under my insurance and I want a drug free pregnancy. Those might be options for you before you start taking medications that could be potentially harmful to baby.
hi I broke my back in 2 places almost 3 years ago, I am fine now but occasionally get chronic back ache, since im pregnant the pain is more frequent. I do pregnancy pilates and that is by far the best thing I have found for it!! its brilliant! also try sitting with a hot water bottle at your back or a warm bath! I find these really help! I hope it helps! :-)