#1 When I finished it and was going to go home, I noticed that something was not right <br/><br/>#2 When I finished it and was about to go home, I noticed that something was not right. <br/><br/>#3 When I finished it and would go home, I noticed that something was not right. <br/><br/>Please tell me which is natural and which is not. In addition, is there a more natural way to say this?