I've stalled

Okay so I have stalled out on my weight loss. I can't seem to get past 171. It could also be that I haven't been as diligent as I could have been. I am going to officially join weight watchers however and hope that that helps. I know that I can totally get within in my target weight by the end of the year. I just have to be more diligent about it. I am glad to report however that I haven't put more weight on. I seem to be fluctuating between 171 and 175.