Night time stretches!

My baby just started sleeping 5 hour stretches the last 4 nights. Hes only one month old. Should i be waking up to pump? Ive been waking right before he does because im feeling super engorged. I will then change him and feed him from one side while putting the hakka on the other side to get the engorgment feeling off the other side also. Its been great for getting a good stash established for when i go back to work, but will it hurt my supply if hes not waking to feed at night?