That symptom is a symptom of ectopic pregnancy and that may be why your tummy looks swollen. Dont panic though because eptopic pregnancies are very rare, get on line a research it. It you are really concerned that you may be having an eptopic pregnancy then I would call your doctor right away.

I looked up the symptoms of an ectomic pregnancy and it didnt say ne thing about lower back pain it just said lower abdomen pain in one side (sharp pain)...Thats all it really said about pains in the lower area