Is my baby experiencing a sleep regression???

So the past two nights around the time when my baby usually goes to sleep super easy, he’s been inconsolable. Just freaking out crying and fussing and nothing (even the boob😱) seems to calm him down for a little while until he finally can’t fight it and passes out.... is this a sleep regression? Has anyone experienced anything like this? He literally never fussed unless he’s hungry or his diaper is dirty and as soon as that’s fixed, he’s good. So this is super weird for us! Lol help please!