Wa'alaikumassalam! Sayang, at 10 weeks, the heartbeat should be visible on scan, but please don't worry sendiri, okay? This really needs your doctor to check properly and explain what they see, sebab timing and scan type matter a lot. Go see your gynae asap so they can assess and give you proper peace of mind, jangan delay! Sending you a big hug, I know how scary this feels.