Spotting and 6 weeks

I have had very light pink spotting with some mild cramps. I had my hcg levels checked 8 days ago hcg was 1925, then 2 days ago was 19,647 and yesterday I was 25,262. The ER said my cervix was closed and they saw a gestational sac I measured 5.6 weeks. Has anyone experienced spotting, no yolk sac and rising levels? I’m worried about miscarriage.