Is this normal?

I'm19 weeks and I'm not really showing at all. I'm just a little bloated. At my appt last week, our little boy had a strong heart rate of 140 bpm. I know it might take me awhile to show (I'm 5'9) but I'm still down 2 lbs from where I started due to the extreme fatigue of the 1st trimester. I'm worried I'm not gaining enough weight and now I'm worried he stopped growing for some reason. A close friend of mine is a labor and delivery nurse and she said they will admit me if I'm not gaining enough weight, which I've never heard of. I would think my doctor would have said something at my last appt if she were concerned. Please help!

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