I had an epidural during the labour, and my legs could sort of move, but only just and thought they would just up the dosage or something when they told me I had to have a caeser but they took the epi out (its a catheter tube that stays in your back) and then gave me the spinal block which paralyses from chest down basically and it a single injection.
It started slightly wearing off while I was in recovery and then about 1-2 hours later I was able to move my legs again (gently under the covers!)
Good luck!