I'm not aware of research that suggests women check more than men, but it may seem that way to you and your friends because women tend to discuss their worries more readily. It doesn't sound as if this is interfering with your life, but if taken to extremes, habitual checking may be a sign of obsessive-compulsive disorder. People with OCD often have irrational thoughts or feel compelled to perform certain acts to ease their anxiety. Even if that's not the case with you, your habit indicates something may be making you uneasy, so I'd advise working to address what might be causing the apprehension. Once you do, you may find that you're doubling back less often.