My wife is 12 weeks pregnant now. 1 week ago, She had difficulty in breathing like whenever she speaks or wall for sometime, she felt out of breath. We consulted a doctor and doctor had done echo of heart which turned out to be normal and her SPO2 levels are also normal. She is feeling tightness in chest and she is not able to sleep the whole night because of this. She also has severe acidity problem. Is this normal during first trimester? And if it is, what can be done to treat this or per se reduce this problem. Please share your experience.