running again

Walked another 4 miles yesterday and then decided to try running the standard 4 miles again today.  I ran pretty slow in hopes that it would make it easier on my body (I'm due in 3 days), and while the run itself was fine and I really enjoyed it, the pain hit about 8 hours afterward and has been absolutely miserable--by far the worst that I've had in the last couple of weeks.  So...I don't know if I'll run again.  I didn't have any nerve pain during the 8 days that I was walking instead of running.