Has anyone had non-rising hcg and still had a healthy baby? Went from 427, 442 and 446 (7 days after 442) final number

So I’m scared. Had an ultrasound last week that only showed the gestational sac. Yesterday it showed baby as 5+6 (should be 6+4 by last menstral cycle, but must have ovulated late) with a heart beat of only 79/80. I go back on the 9th for follow up scan to see if baby still has a heartbeat. Super scared as this is what happened when I lost our angel baby in 2018.

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