bluefairy5 - I believe in the beginning it has to do with the blood volume. Then your body adjusts a bit just in time for your growing uterus to crowd your lungs and cause more shortness of breath!!
Edit because of typo
Isn't the human body just charming? This whole gestation design is really flawless. /sarcasm
Haha yes - every week on my ticker change, I send my husband the possible symptoms/ fun facts for the week and he always is shocked at how much it effects the entire body. He agreed that if men were responsible for pregnancy, they human population would cease to exist.
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