Building muscle while losing fat=Frustrating process. PLEASE HELP!!?

I’m 5’8", female, 20 years old and weigh 139 lbs as of this morning. The thing is I weighed 138 yesterday. I did nothing during the day that would cause weight gain. And I know that it’s impossible for a woman to put on 1 lb of muscle overnight. I’m doing everything right (to the best of my knowledge anyway). I’m on a high protein, moderate carb, and low fat diet. I do boot camp 4-5 days a week which is a lot of weight training and compound exercises. I also do pilates 3 days a week. I’ve been doing this for about a month and there has been virtually no change in my weight. I weighed 144 when I started. And I’m not losing consistently. Some days I’ll gain a few ounces or a pound even and some days I’ll lose or I’ll stay the same. It’s a slow process. I look better overall but the only place where I really notice a difference is my hips. I’m not eating very many calories. I usually keep it under 950 cals a day. I know that’s considered undereating for a lot of people but I used to be anorexic so my metabolism is messed up. If I eat even 1500 cals a day I end up gaining weight. And I’m still maintaining or building with the amount I’m eating now. So what should I do to speed up fat loss? Drop my calories? I’m thinking of adding cardio a few times a week to speed things up. Any suggestions? What kind of exercise and for how long? Or is there a specific kind of food or supplement I should be taking? I want to weigh between 125-130 and be really toned and fit. What else can I do to make that happen and soon? And I’ve recently started eating more fruits but not enough to cause carb overload. Usually about 3 servings of fruit per day. Is that the problem? I heard that fruit isn’t conducive to weight loss. Thanks for reading and thanks for the help!

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