Sleep Regression or Daylight Saving Time Change ?

Hi moms , I’ve been struggling with my 15 week old ever since the time changed. The whole little schedule we had I feel like it went to the trash. We are all over the place now , she’s barely napping during the day & at night she’s waking up every 2 hrs ( she used to sleep 6-8hr long stretches ) I’m aware babies go thru a sleep regression around 4 months is it possible this could be a sleep regression or is it due to the time changing? I also want to add it seems like now she’s ready for bed around 5:30-6pm (which makes sense because her usual time she used to go to sleep was 7-8pm )