Sesak nafas pada early pregnancy boleh jadi normal sih, sebab hormonal changes dan uterus yang membesar tu memang boleh affect breathing, tapi kalau frequent sangat atau disertai chest pain, dizziness, atau palpitations, better check with your doctor je, just to be safe lah. A few of my mum friends experienced the same thing early on, pastu it settled down, but everyone's different so don't take chances.