I did 7 miles on the treadmill. My lower back was sore, so I tried doing some stretches. The next day I had picked my 18 month old up and put him on the changing table. When I bent over to change his diaper, my back completely gave out.
So, for now, I am resting, icing, stretching, taking Aleve, dreaming about running, and wondering if any of you other running moms have ever had a similar problem.