There's typically a couple stalls that lasts for 2-4 weeks that happens after surgery. I've heard them typically referred to to the 3rd week and 3rd month stalls when they typically start, but can happen any time. Our bodies have to recalibrate things after substantial loss, and it will hold on to fat and/or fluids until it knows its safe for it to lose more. As long as you stick to you calories, macros, and fluid requirements laid out by your doctor, the weight loss will resume.
Restart your diet and track everything closely. Also go back to weighing yourself weekly instead of daily to reduce stress. Additionally, if you are working out more than you were pre surgery, keep in mind you may also be gaining some muscle weight, which offsets the number on the scale. If your clothing sizes are getting smaller, you're still on track!
It is very frustrating as I just came out of one, but I did slack off on tracking my eating closely over the holidays. Even though I didn't feel like I was eating that much more, I had crept back up around 1600 calories a day by having a treat I thought I had earned. I didn't realize it was so calorically dense and was a big mistake for me. I was using it to feel better after having covid over Christmas and New Years, but it did throw me off track and made my stall worse. I'm back on the strict diet this week and its starting to drop again.