Can I get and earlier flight

Depending on the availability of the flight the time of your flight

That is determined by the airline you are flying on. Right now, they are a bit flexible and it might be possible. Make sure you change your flight prior to checking in. If you do check in and want to get on an earlier flight, it also makes it easier if you don't have any luggage that you check in. If not, you might get on an earlier flight but your luggage will leave on the flight you were scheduled to leave on.