Supply dropping on one side

Se

My baby is 2 months old and EBF. So far he’s been doing great, we alternate sides on which we start and he’s had no issues nursing on both sides per session. Plenty of wet and dirty diapers and been gaining weight well. About a week ago he started crying every time I switch him on my right side. If we start on right he will nurse on both but if I start on left he will refuse to nurse on the right. As a result the gap between sessions on that side is 3-5 hours. I pumped a couple of times and 3 hrs after feeding will only get 1 oz on right. Should I always start nursing on that side until it catches up? Keep pumping? Please help any advice appreciated.