Do yourself a favor and don't get on the scale more than once a week at the most - once a month is even better. Your weight will fluctuate during the day and from day to day depending on what you've eaten and how much or little you've been moving around.
Another tip: Gain muscle by lifting weights and don't stress out too much over cardio. You don't have to go to a gym or buy expensive equipment either. Muscle burns more calories than fat. You can get your heart rate up easily lifting weights if you circuit train. Learn the proper form though; it makes a huge difference.
If you need ideas for different activities to do, a quick search online will bring up many you can do at home.
Weigh yourself in the morning, before you've eaten. You will get your correct weight then. But don't weigh yourself the morning after you have had a massive meal.