Aww alam ko na yan ang feeling, first time mom struggles talaga! Three weeks will go by fast, and most likely makikita na ninyo si baby with a strong heartbeat by then, try not to stress too much kasi normal pa lang yan sa ganitong stage. One of my mum friends was also worried during her first scan pero perfectly fine naman si baby, so sending you lots of positive vibes! Just take care of yourself, eat well, and rest as much as you can habang naghihintay. You've got this, mama!