Waking baby every two hours

My son is only 5 days old and I noticed that he will sleep through the night if I let him so should I set an alarm to be feeding him at this age? Being he’s still fresh out the womb I get worried he’s not feeding enough throughout the night. I currently do wake him up every two/three hours to make sure he eats and I’m wondering if that’s the right thing to do. He has his first pediatrician appointment tomorrow so I will definitely be mentioning it and asking his dr as well.

ETA: I’m exclusively breastfeeding so I also worry about my supply if I don’t feed him on a schedule at night. And I don’t think he’ll wake up when he’s hungry because when I do wake him he latches on so fast likes he’s starved lol