Stocks were flat at Wednesday's openings bell as Fed Chair Janet Yellen prepares for day two of her testimony to Congress. U.S. markets got a boost after her remarks to the Senate on Tuesday. Investors were reassured a rate hike will likely not come until the second half of the year. Yellen is set to speak to the House Financial Services Committee at 10 am eastern. Earnings results before the bell are giving some stocks a lift in early trading including Lowe's (LOW) and Target (TGT). Lowe's posted earnings of $0.46 a share and $12.54 billion in revenue. Target posted earnings of $150 a share, excluding one-time items and revenue of $21.75 billion. The big box retailer said its expanding online business helped beat estimates for the key fourth quarter.