Hi welcome to Health care magic forum.
Thanks for calling H.C.M.F.
You are a female of 27 years, 5' 11" height, and in 3rd trimister of pregnancy
.You had over weight. asthma
with bouts of exacerbation in the night. and G.E.R.D.
Your B.P and pulse are with in normal limits.
Over weight people will be lacking cardiac compensation, and may cause exacerbation of the breath lessness. G.E.R.D.should be treated otherwise there will be feeling of breath less ness .
I advise you to consult a physician for diagnosis and treatment. You may need to have an xray chest, e.c.g. to exclude any abnormalities to prevent any problems in delivery.
Wishing for a comfertable life and delevary.