Been using this for a week

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Just wanted to introduce myself. I'm a big girl and have been for almost all my adult life. I have recently (in the last 8 months or so) lost approximately 44 pounds. I have started doing the insanity workout (about a week ago) and my weight was going UP not down...I was stressing and its so disheartening to see that my app tells me that I have lost ZERO pounds towards my goal. Sigh. I am staying under my calories almost every day (occassionally I may go over by 30 calories or so) but then I also do 42 min of Insanity in the evening. I just cant figure my body out. HELP.