Sharp painful latch

FTM here. My LO is 6 days old and bf has gone pretty well so far. Only the last two days my left nipple is so painful when he latches on and continues while he nurses on that side to the point where I have to break him off and am only able to get him to nurse for maybe 5 mins but in pain the whole time. I’ve tried different positions and to re latch him making sure he gets in deep. It doesn’t hurt when I pump or use my hakaa on that side so I know it’s something with him.. other side he latches on just fine. I don’t feel any hard bumps like their would be a clogged duct or anything. I always use coconut oil after I nurse as well and heated nursing pads and massage as well. Could this be an infection already? My nipple isn’t red or visibly irritated at all and doesn’t hurt other than when he latches on. Please help 😞

Also is it okay that I just let him nurse longer and more frequently on the other side and just still use my hakaa on the left until it feels better or will that mess up my supply on my left side?