I own him in a redraft, so as a Pierre Thomas owner, I can tell you- chill.
Don't sell low on him. Watch this next game against the Bills. If he performs moderately well, considering he's coming back from injury, hold him. Ignore any results to the following again, when he plays the Jets and likely won't perform as well.
Then he has a bye. So really, the best time to seriously entertain trading him is after week 6, when he's played the Giants. By then, you'll have a better idea where he is. Trading him now is closer to his floor value than his ceiling.
You shouldn't consider any trade between now and that post-wk6 point that doesn't give you 80% or more of the value that it cost you to draft him.