For most mothers, allowing baby to nurse long enough on one side so that he gets more of the creamy, higher fat milk helps balance lactose and fat to ease digestion and usually corrects the problem. And, he may go longer between feedings if he is having a "meal" that includes both the "appetizer" (foremilk) and the "dessert" (the hindmilk).
If you are exclusively pumping I would back off on pumping sessions. If exclusively breastfeeding I would give a bottle during one feeding session to let your body get regulated.
This would depend on what you mean by an imbalance. If you are concerned that your baby is getting too much foremilk and not enough fat, this would be shown through a slower weight gain and a drop in percentiles over time. If this is the concern pump an ounce before feeding to decrease the amount of foremilk comsumed.