Sayang, sesak nafas dan sakit dada tu memang boleh jadi normal during pregnancy sebab rahim membesar, tapi please see your doctor or go to hospital immediately kalau you're worried , especially if the chest pain terasa intense atau shortness of breath teruk. Jangan delay k, better safe than sorry! Pregnancy does funny things to our body, a few of my mum friends had breathing changes jugak around that time, tapi sebab every pregnancy is different, doctor kena check you properly to make sure semua okay. Take care of yourself!