I will admit that I am new to this weight loss business. With that said, I have had to change my eating habits due to being diagnosed with Type 2 diabetes. What I did is let Fit Day calculate what my calorie count should be and made sure that I logged everything that went into my mouth. I am 5'7" so a bit taller than you and it calculated 1610 calories a day for me. I do not allow myself the extra calories calculated due to exercise. I am loosing 1-2 pounds a week which I feel is a decent amount.
Just my 2 cents worth