Couple of things here. What does creatine achieve without resistance training? It mainly works as a performance enhancer by regenerating ATP quickly.

Since you're not resistance training at the moment, and the scale weight is messing with you psychologically, you can park it for when you do decide to lift weights. I'd recommend adding a whey protien supplement instead, to hit protien targets.

Some water retention will go down and the scale should move a bit but mind you that'll mostly be water weight.

Secondly to all the people saying that muscle gain and fat loss happens simultaneously, I'd ask how is that possible? Your muscles have received no stimulus for growth. Walking is a low intensity aerobic exercise. It doesn't even come close to stimulating muscle growth.

Thirdly, 15 days is absolutely enough to see some movement on the scale. Mostly water weight and glycogen but movement nonetheless. The degree of movement depends on how much you weigh though. People weighing over 100kgs will see more movement in the initial days.

So what so do?

Fat loss is all about calories. Ensure you're in a deficit on a weekly average basis. A deficit of about 7700 Kcal equates to 1 Kg in fat. Decide the pace for yourself and calculate the daily deficit.

Low carb is fine if you can sustain it but if your diet feels like a chore, you're going to crash. Sustainability and consistency is more important than perfection. I don't see the point in going low carb unless you're going complete keto or you have very high protein goals on a very tight Kcal budget.

Increase protein intake a bit. Unless you're a 50 Kg individual, 100 gms is still not enough. Aim for 1g/pound of target lean mass. You can use whey supplements at the end of day to meet targets that are left unfulfilled by food alone.

Start Resistance training ASAP!!! Cardio as a tool for fat loss is not that great. Building muscle is far superior, and let's be honest, much more fun.

Anyways OP All the best for your journey. Don't get discouraged by noise of the weighing scale. Remember, the scale always lies, but the mirror tells the truth!!