Sore Back

Whenever I get stressed, my upper back always gets the brute of the tension.  I keep hearing that during pregnancy, the lower back is supposed to hurt.  Now, I'm not expecting this for a bit.  However, this morning, after I got up and started walking around a bit, I found that (along with my calves) my lower back was aching.  Not cool.  After the bike ride to school, with my backpack, the pain has receded to the upper back again.  Oh well, I'm sure it will even out eventually.  :-)