Ftm pumping question

A
I'm 10 days postpartum and I'm using an electric pump as my little boy won't latch. 
I'm using formula for most of his feeds and giving him as much breast milk as I can pump. 
I pump every few hours during the day and usually manage about 2oz from my right breast in one sitting. 
But I rarely even manage to express half an ounce from my left breast at any one time. 
My left breast isn't lumpy and it doesn't feel like it's still engorged when I'm finished.
 I'm just wondering if it's normal to get a lot more from one breast than the other? X