Oish, boleh je kena tiroid masa pregnant, dear, a few of my mum friends kena during pregnancy jugak. Since your doctor dah mention and noticed your weight loss, best you follow up properly at the next checkup so dia boleh test and confirm apa yang happening. Jangan worry sangat dulu, but do go to that appointment ya, important for you and baby. Tiroid things boleh managed once confirmed, so let your doctor guide you. Hang in there!