Breastfeeding

I have been breastfeeding for a month and been pumping when she isn't nursing and well one of my breast when I pump on the left side I can get 3-4 oz at a time. On my right side it's like I can only get 1 oz when I pump one time I feel like nothing is coming out when she is nursing!! I have tried everything I am drinking a lot of water plenty of sleep eat good what can I do