Breastfeeding & pumping..

Stephanie
When I feed my LO in the morning I usually pump my other breast as well, I normally only pump for 15 mins on max, while she normally eats for 30 mins. The next feeding I would normally only feed on one breast but I'm thinking I should feed on both breast now 15 each, equaling 30 mins. Would changing the way I feed her mess with my milk supply?