There may be some consequences if the Federal Reserve doesn't raise interest rates in December. "If they don't raise rates [in December], that's going to be a much bigger shock, so I think they are kind of locked into raising rates," said Brad McMillan, chief investment officer at Commonwealth Financial Network. McMillan said if the Fed wasn't going to hike interest rates in December, that should have been indicated in Yellen's congressional testimony on Thursday. In her testimony, Yellen said that a rate hike could come "relatively soon" though December wasn't mentioned. Investors are pricing in a 90% chance of a liftoff in December. TheStreet's Scott Gamm reports from Wall Street.