Metabolism

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I am really starting to get frustrated! I have been using MFP now for a month. I work out regularly and according to the system I should have lost close to ten pounds by now...I am at 3 pounds lost total!! I rarely go over my calories, and exercise at least 5 times weekly!!
I am starting to concern myself with my metabolism, but I am afraid if I ask my doctor they will just tell me it is because because I recently had a baby. (She is three months old)
Im starting to get really discouraged.