Did you find much on your original topic? Or are you rethinking it now because of what you’ve seen in the articles? Yeah, this is where you take a moment to adjust your topic based on the evidence you've found, or you’ve changed your mind, or your professor changed his/her mind, or what have you.
Do you have the flexibility to change the topic? Do you want to? If you have the flexibility and desire, go for it! If not, guess what you get to do. Community Chest says "go back 3 steps."