Breastfeeding help.

Ca

My baby boy is 11 days old and suddenly my left breast doesn’t produce a lot of milk but my right breast produces a LOT! Any tips on getting my left to produce more? He still nurses on it and I make sure he tries that boob first. So it’s getting the stimulation for 15 mins every 2-3h I don’t get why im not filling up tho ... any help is appreciated !