Here's what investors will be watching this week
Here's what investors will be watching this week · CNBC

Thanks to a nice surprise from Friday's jobs report , stocks managed to eke out some pretty modest gains last week even as investors continued to question just how long the rally can last.

The Dow (Dow Jones Global Indexes: .DJI) is now up nearly 8.5 percent for 2017, thanks to about a half-dozen companies that are carrying most of the weight. But economic signs have been uneven, the political landscape in Washington, D.C. remains in disarray and the world is coming off a stormy summit of global leaders where anti-globalization rioters filled the streets.

So where does that leave you, the humble investor? With a week ahead filled with potentially important news to keep a close watch on.

The profit picture

An expected revival in corporate earnings has helped drive the market rally this year, and the first quarter did not disappoint, with growth of 13.9 percent for companies in the S&P 500 (INDEX: .SPX).

Second-quarter earnings season kicks into gear this week, with hopes still strong though not quite so optimistic. Bottom-line profit is expected to grow 6.6 percent from the same period a year ago on sales growth of 4.9 percent, according to market data provider FactSet. Energy is supposed to see the biggest growth; without the sector, the overall earnings growth forecast would fall to 3.8 percent.

The early companies to watch will be primarily banks. A slew of them report on Friday: JPMorgan Chase (NYSE: JPM), Wells Fargo (NYSE: WFC), Citigroup (NYSE: C) and PNC Bank (NYSE: PNC).

Remember: Earnings figures are backwards-looking. What you need to look for is what CEOs expect in the future. That's where the market will be taking its cues.

Who to watch

Put Janet Yellen on your radar screen for the week. Yellen is the chair of the Federal Reserve and an influential voice on the economy.

She heads to Capitol Hill midweek to deliver her semi-annual monetary policy report. Though it sounds like dry stuff, these hearings sometimes get contentious. The Fed is in the early stages of steadily hiking interest rates , and that means higher bills for credit cards and any other kind of adjustable-rate debt.

Yellen's agency has plenty of critics on the Hill, and they'll likely grill her on issues ranging from why the Fed is determined to hike rates amid low inflation, and what it is doing to keep banks safe.

The Fed is expected to hike its benchmark rate at least once more this year, and to begin the process of unwinding the $4.5 trillion balance sheet it built up to pull the economy out of the Great Recession. Investors should expect some clues about where Yellen sees the economy and what the Fed will be doing going forward.