Sayang, sesak dada dengan kesukaran bernafas macam tu, especially kalau disertai mual, kena check dengan doctor atau pegi A&E sekarang juga, ok? Jangan tunggu. It's better to be safe, especially tengah pregnant. A few of my mum friends experienced shortness of breath during pregnancy, tapi kena confirm dengan medical team sebab ada banyak possibilities, doctor kena assess you properly. Jaga diri, and please go get checked out sekarang. Thinking of you!