Aww, I totally understand la, first trimester memang boleh jadi scary sangat! Honestly, mengah nafas macam tu quite common actually, especially early on. Your body is going through so much hormonal changes and your uterus tengah expand, even if you x feel obvious symptoms yet. Some mums in my group mentioned the same thing around your weeks, and most of them said it settled down by second trimester once their body adapted better.
That said, since you're feeling uncomfortable even when resting, it's definitely worth checking in with your doctor or gynae just to rule out anything like anaemia or breathing issues, better safe than sorry at this stage, especially since it's your first time. In the meantime, try sleeping with extra pillows to prop yourself up a bit, and take things slow. Hopefully your body settles soon, but don't ignore this if it gets worse ya! Sending strength