Do you wake baby up to feed at night?

LO is 8 weeks and EBF. Have been feeding her about every 4 hours at night. If she starts to sleep longer stretches or through the night on occasion, should I be pumping? Not sure where to start as I'm not sure if not pumping halfway through the night is going to affect my day time milk supply or maybe pumping will create an oversupply? But what if I didn't pump and my night time supply drops but baby starts to wake up more frequently again? Confused on how to go about this. TIA