Pumping question

Does pumping make baby want to nurse? I am trying to get some more milk for the week since I don't pump that much at work (3-4 oz 1 pump, 2-3 the other) pump 1-2 times when I get home. I supplement with formula due to low supply. This morning I nursed him at 8:15, gave oatmeal with peanut butter at 9:40, pumped at 10-10:10. Well he was crying while I cleaned up after. He is nursing again (about 30 min after pumping and he his happy again). Do you think my pumping in front of him ticked him off? If so any suggestions to help? I was planning to nurse around 11/11:30 then nap. Thanks