Alah, at 16+ weeks memang kadang boleh nampak tapi not 100% sure lagi! A few of my mum friends kena suruh balik jugak kat 20-21 weeks untuk confirm, because the angle or baby's position sometimes bikin susah nak tengok clearly, especially if first scan. So jangan stress lah, just take it as a sneak peek first, and tunggu the official reveal at 21 weeks! Hope your tummy ache settle down soon though, that must have been scary.