When is shortness of breath in 3rd trimester bad?

I'm 35weeks and I'm constantly out of breath which I have pushed off because our little man is a biggin. I am getting to the point I cant stand without being breathless and now I'm more tired than ever which only happens when I'm super out of breath.. just looking for some advice or hints as to what to do. I see the doc Monday so I'll bring it up there too.

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