Is this the sleep regression?

L 👶🏼🤎✨

My son is 15 weeks today and this has been going on for a couple weeks now where he wakes up every 3 hours at night and isnt wanting to nap during the day and when he does its for short amounts of time. But he isnt crying a lot or super cranky, is this considered a regression? He usually would sleep 4-5 hour stretches at night 😓 He’s also been more hungry lately too idk if that has anything to do with it?