Saya rasa normal je, pregnant hormones memang boleh buat benda pelik macam chest tightness especially first trimester, tapi sebab tidak selalu, better check with your doctor just to be safe, terutama sebab dulu kau experience kat trimester 3 je. A few mum friends I know ada yang rasa shortness of breath or tightness awal-awal pregnancy sebab perubahan hormones and circulation, tapi everyone's different lah, so best confirm dengan gynae you to rule out anything else.