Running LG UltraFine 5k with additional low DPI screens

I have the following hardware: * 2018 MacBook Pro 13'' * LG UltraFine 5k * 2 x ThinkVision 1920x1200 Ideally, I would like to connect these 3 screens to my MacBook Pro. I connected the LG UltraFine 5k on one side of the MacBook Pro, and both ThinkVision screens on the other side. Currently, I only manage to get a most 2 of the screens running. Is this a hardware limitation? Or is there a way to get the 3 screens at once.