Hi, The only way to really know if any update has hurt or helped you is: "to look at your search-driven traffic from Google". If you have seen a significant increase in traffic, it means you have probably been rewarded by it. A big decrease? Then you were probably hit. You can see your website traffic using Google Webmaster tool, Analytics tool, Feedjit etc ..
Well, exactly like @madhu said login to your webmaster tool and check the traffic count i.e if there's a big decrease then you're probably hit and if there's a big increase then ....