Ebf but just pumped and it’s very uneven

I've been EBF for 3 weeks now without pumping once (in line with my ob, pediatrician, and LC recommendations for me and my goals). Just pumped for the first time so I could get some extra sleep and someone else can offer bottles. Pretty shocked to see how uneven the amounts are per boob! Baby is 6 weeks and spends the same amount of time on each now, so I thought theyd be about the same. Like one had maybe 2-3x the milk with the pump. Should I be concerned? Is this a representation of what baby is dealing with?