Okay, so it's very common to have a stall, and they can last several weeks. It's not because of anything you're doing, and aside from just stopping to assess that you are still following your plan in a reasonable way, there's nothing you can do to change it.
Are you hitting your protein goals? Getting your hydration? Eating on a regular schedule and prioritizing your protein and non-starchy veggies? Sticking to a reasonable portion size by using a small saucer or luncheon plate? Avoiding empty calories in the form of sugary drinks, simple carbs, and snacking or grazing? Getting some basic movement every day, like going for a walk or using resistance bands? If no to any of these, focus on changing that issue. If yes, try not to panic. You will likely start losing again soon, but possibly slower than before because that's just how it works.
In the meantime, take your measurements or try on some clothing to see if it fits differently. I recently had a month of very slow loss, just 2.8 lbs in 4 weeks with so much up and down. But my clothing fit differently and my measurements were getting smaller. All of a sudden, I lost 10 lbs in 3 weeks. I did nothing differently.