The BSE benchmark Sensex gained nearly 20 points in early trade today .The 30-share barometer rose by 19.71 points, or 0.10 percent, to 19,627.79. The index had gained over 147 points inthe previous two sessions.Similarly, the wide-based National Stock Exchange index Nifty edged up by 5.05 points, or 0.09 per cent, to 5,938.