Turnitin.com FREAKED out help!?

for my english cl we had multiple hw ignemnts. some were extremely difficult so i used the internet as a reference i used some facts i found into the paragraphs but i used my own words.. will i get in trouble? also, i heard the only thing it checks is other ppls papers also submitted.. do they check all over the internet also?! im kind of freaked... so basically if i rephrased a couple sentences that i used form the facts i wont get in trouble..?