First trimester will shortness of breath ?

Yes, there is a possibility. "In the first trimester, increased levels of progesterone may make breathing a bit difficult at times as your body adjusts to new hormonal levels. In the third trimester, your lungs and diaphragm suffer a space crunch as your uterus expands upward, making it harder to take a deep breath." quoting from http://www.parents.com/pregnancy/my-body/aches-pains/pregnancy-shortness-of-breath/. I think try to take things slower. Try not to rush things. Do deep breathing exercises whenever you feel that you are getting short of breath. It will get better don't worry.