Trying to lower body fat percentage.......

I've been logging and exercising for about a month now give or take a day or so. I've had cheat days yes but I've been pretty consistent in my logging in. I've been burning on average 400cals a day and eating around 1500. On some days I burn more and eat more but my net cals are never above 1300. Am I eating to many calories? I'm a runner, long distance, so normally I've been logging in 3-4 miles at 5.0-6.0 speed. Should I start focusing on interval running for a shorter time or should I cut my exercise down so I can cut my calories as well?