A lot of people think that they will regularly lose weight, even a little, but our body doesn't work like that. A lot of people (most) will find that their weight will go sup slightly for a while, but it doesn't mean that you are doing anything wrong. There are a lot of variables to take into account.
If your weight has been static for a few weeks, take a very good look at what you are eating. Hopefully you are weighing all your food for increased calories, and entering it into the Nutrition Tracker? This is particularly important when we hit a stumbling block because often we tend to over-estimate how well we have been doing nutritionally. I tend to focus on 'nutrition' because most of weight loss comes down to nutrition.
I would also track sodium because that is a HUGE factor for a lot of people. I tend to eat in the low-mid recommended range for this, and can very easily tell without looking at my tracker, when I have been closer to the higher end of the range. I feel stuffed and bloated, and my clothes are tighter. I can easily gain an extra kg or 2 for a couple days after.
Other things can impacts on it, too. Our health in general. If you are worried talk to your Dr and ask for bloods to be done to rule out the usual culprits .... hypothyroidism being one of them.
Are you on any medication which could impact on your weight? If so, your Dr may like to review them and see if there is an alternative.