Should be fine. Your body will adjust accordingly. As for me, since I want to store some more milk in the freezer, I always pump out my milk in the morning after feed, since that is when the volume is highest. Also, once my baby drops the 10pm feed (latest feed 7pm), I will also pump out my milk at 10pm, just to keep my storage supply up.
You must try to get him off to a bottle / cup soon, since he cannot continue to suck from you forever. Also, he needs to drink water after he weans. Also, pumping is not only for storage, but also for keeping the milk supply up when baby is not drinking so much.