Alamak, I know how scary that must be! Honestly la, a few of my mum friends kena COVID masa pregnant juga, and their babies turned out fine, especially since they were fully vaccinated. The vaccination really does help protect both you and baby, so that's the good news. But because you're in third trimester and this is such a pregnancy-specific situation, I'd really suggest checking in with your gynae or midwife asap, just to get personalized advice and make sure everything's being monitored properly for your peace of mind. Jangan risau sangat, most vaccinated mums I know delivered healthy babies, tapi better safe than sorry kan.