Actually it can be a lot longer than 2 weeks - but if you're only doing cardio and calisthenics your muscle gain won't be as great. Do you keep track of how many calories you eat? Do you intake a lot of sugar? How about fiber - fiber itself can help you lose weight. The problem with a low-carb diet is that you have to maintain that lifestyle in order to keep the weight off; once you fall off the wagon it's a slippery slope.
Drink a lot of water - and I mean a lot. Water is a natural fat burner, and, especially in this heat/humidity, you'll be losing a lot, which means you can dehydrate easily. Keeping yourself well hydrated can actually help you lose weight.
Don't get discouraged, hitting a plateau is natural. Sometimes it just means your body is trying to adapt and that might take a few weeks.
Increase the intensity of your cardio, too - maybe you've hit a wall with what you're doing.
Good luck, and stick with it!
When you wish upon a falling star, your dreams can come true. Unless it's really a meteor hurtling to the Earth which will destroy all life. Then you're pretty much hosed no matter what you wish for. Unless it's death by meteorite.