The OS has the ability to audit user actions, but it's not enabled by default - in fact, you have to download some extra software from Apple & enable auditing. So, what you did yesterday is lost in the sands of time...
One thing you might do though is try in terminal:
find ~ -ctime 1
which will list all files in your home directory whose change time is within the last 24 hours. To find all files whose change time is between 24 and 48 hours ago, you'd use '-ctime 2' and so on...
You can also look at all files in the entire computer whose change time is in the given window (which would be a much much longer list), you'd use
sudo find / -ctime 1