Ultrasound at 6 weeks, high HCG, too early?

We have 3 yr old toddler, had 2 MCs and expecting again. My HCG was at 15,500 at 5 wks 3 days, today at 6 wks exactly we had an early ultrasound for viability and saw just gestational sac and yolk, just flickering but no confirmation of pole yet... per dr and ultrasound technician, maybe too early. We are having second ultrasound Feb 19th... I’m hopeful but try not to build myself up either. has anyone experienced something like this? Did things turn out well?