just had first baby 5 months ago trying to lose weight.

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Hi my name is sarah I'm 21 ex military and currently a stay at home mommy and army wife(hate that term). Im looking for some advice and/or help. I just had my daughter 5 months ago and for the first time ever I was put on the depo shot which i am due for my second shot and I am definitly not. I was running 10 mins everday and nothing happened I still weigh exactly the same as when I had my girl. We dont eat butter, sugar or salt in our house and I am a vegitatrian as of 8 years now. I just started the classic version of p90X last week and still nothing. Help? what am i doing wrong?