Click on Search at the top of the forum, then advanced search, put in your user name in the "Search by User Name" then choose for the last week in the the "Find Posts from.
That should give you a list of the last week's thread you've been active in.
Also you can setup your account so it sends you a message everytime someone replies to a thread you've been active in.
Go to Account on the top of the forum, then choose "edit options", Messaging & Notification, and set the option in "Default Thread Subscription Mode".
