Weight loss plateau

Im feeling super discouraged. I started insanity a while back, I'm in my 3rd week of the second month an I'm seeing no results. The first month I saw an enormous change, I was 185, dropped to 175, lost 3 inches of my waist and Im a lot stronger. Now I'm stuck an it feels like Working out is a waste. I know the first month I ate good, maybe around 1400-1500 calories a day, an I know ur suppose to up the calories the second month, an I have 1650-1700 calories a day, and I eat healthy! I track everything I eat an make sure I eat the right amounts. It's just not working. Can anyone help me overcome this stop?