2yr sleep regression?

Anyone else been through this? How long did it last? My sons “sleep regression” has been lasting for 2 months now and I’m beginning to think it’s not so much of a regression as it is maybe his schedule is changing?? He’s always gone to bed at 8. The last 2 months we put him to bed at 8 as always and he keeps getting up and coming out of his room and crying and just trying to fight it and he will do this until 9/9:30. Is this a regression or does it sound like his schedule is changing? I’d hate to keep him up til 9/9:30. That’s too late for a toddler and too late for me. I would love to be asleep by then..

he’s also been waking up earlier too. Like 6:45/7:00. So he’s staying up later and waking up earlier. He used to sleep 8-8

help??