Supply Question?

Is it possible to not really have a lot of leaks? I have had some leaking from my breasts but I wouldn’t say it happens often. Is that normal? Or does it mean my supply isn’t great. We’ve had to supplement my daughter with formula and pumped breast milk because she’s had issues with gaining. When I pump I always seem to do ok. I get about 4 oz in a day of saved milk. I will say I pump after she is fed so I’m not always certain how much she gets. I have weighed her before and after feeding and she has gained up to 2.5oz after a feeding. Any tips/advice/thoughts?