Take life into account, some days you eat more, some days you can eat less, some days you retain more water and other days you feel great. Water retention of random weigh ins don't tell the full story when it comes to just tracking weight.
Although we love to focus on performance, photos and how we feel as an indicator of progress, If you want to be extremely accurate and losing excess body weight will improve your lifestyle, track your weight every morning (After you use bathroom and before you eat preferably). leave a diary down by your side with a pen and each morning, write the date, the day and your exact weight. On Sunday, get the average of week 1. Then after 4 weeks, get the average of month 1. compare week to week and month to month, rather than random days that don;t take some variables into account.
You will notice the trend is a lot more clear when tracking like this, whether that is your weight moving up, down or stagnating. What gets measured, gets managed.