Is anyone else’s baby nursing less?

I don’t mean bottle or formula. I mean like exclusively on the breastfed. My baby went from nursing 2.5-3 hours or nursing to 1 hour 27 minutes today and nursing only 2 hours yesterday. She’s impossible to wake up to eat when she’s sleeping. She loves her sleep. But I also would like my supply to it tank. Should I worry about that? She’s 8 weeks old so maybe my supply has regulated already? I don’t know what to do. I’m so stressed she’s not eating enough.