6 weeks, no heartbeat

Hello all .. recently had my first appointment and by my dates I would have been 7 weeks, 1 day. I have a bit of anxiety anyway and explained I didn’t really “feel” pregnant. To ease my mind she said I can send you for an ultrasound to see what they can see. Went the next morning and they measured me at closer to six, saw gestational sac and yolk sac, but no heartbeat. She also found a Subchorionic hematoma, and told me no heavy lifting or exercising. I return for another ultrasound in two weeks, and I’ll repeat a blood test for hcg levels the day prior. My hcg levels are over 20,000. Anyone experience anything similar? I of course want to be hopeful and optimistic but also want to weigh on realistic side as well. I’ll also mention that I haven’t had any serious pregnancy symptoms, or bleeding, cramping, or spotting. Thank you all for reading :)