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Dow Jones hits all-time high

Jacquelyn Martin / AP

The Dow Jones Industrial Average hit an all-time high by 146 points Wednesday morning with Yellen's upbeat testimony on the U.S. economy on Capitol Hill, per CNBC, where you can see the latest on the Dow Jones. (For context, the S&P 500 gained 0.7% and the Nasdaq gained 0.9% this morning.)

Reasons to be positive include: economic growth hitting a stride after a slow first quarter and U.S. manufacturing and exports getting stronger.

So Yellen wants to keep raising interest rates but did not shed light on when that would happen. (The Fed has raised the interest rate three times since December to between 1-1.25%.) Wall Street is not entirely convinced an interest rate hike will happen, Business Insider reports.