My Achin' Back

Aside from the very end, my back has never bothered me during pregnancy. Even with massive, and I do mean massive, weight gains. My feet sure, but my back never. Until yesterday that is. The only thing I can think of was that I sat in a hard kitchen chair leaning forward for too long. Weird I know, but that's when it started hurting. I'm positive it's muscle pain. I have no other other symptoms and the tenderness is constant. Heat seems to help and I was able to sleep okay last night. I tried to take it somewhat easy today with the result being a messy house and bickering girls. I really hope this is short lived and I'm going to be more careful throughout the remainder of the pregnancy.