After I pumped a few times I even started to pump one side while my son fed from the other (the football hold worked best when
pumping the opposite side). Either way it will
increase your
supply because you are expressing more milk, make sure that you have nursing pads on hand if you haven't used them yet as you might become full quicker. If you are just pumping to have some to use while you are out you might want to try only once or twice a day so you don't start making too much.