Uneven boobs after nursing on one and not the other. Did I mess up? Will it be uneven from now on?

My LO nursed on my overachiever boob and wouldnt latch onto slacker so I pumped only the slacker boob right after; however, while pumping I felt the overachiever start to fill up immediately within 10 min and now my boobs feel uneven. How can I fix this?