Wells Fargo, Citigroup and JPMorgan Chase basically kicked off the Q1 earnings season on Friday morning by delivering results that mostly topped expectations. All three beat on both earnings and revenue expectations. All three stocks were up around 1% following their reports, only to sink into the negative as regular trading opened. All ended down significantly on a day where the S&P 500 was down only fractionally.There was a lot that the markets tried to digest week - strikes in Syria, a possible re-entry into TPP, a de-escalation of trade war fears with China and earnings. It's difficult to pinpoint Friday's move to just a single thing, but one reason could be worries over the yield curve. The spread between 2-year and 10-year Treasuries narrowed to its lowest level in years.If history is any guide, as that spread turns negative, a recession is usually on the way. With Fed Vice Chairman John Williams stating that the real GDP trend is below 2%, we could be seeing a "sell the news" reaction. Whether we see this type of reaction in this week's earnings from Netflix, Bank of America, Goldman Sachs, GE, IBM and Johnson and Johnson remains to be seen.What do you think? Are you worried that the market could sell off on earnings news over the next few weeks? Vote and comment down below!