HCG Levels

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Anyone have similar experience with hcg numbers? Had d&c; 5 weeks ago at 10 weeks

Hcg 2 weeks after was 437

Hcg 3 weeks after was 143

Hcg 4 weeks after was 70

Hcg 5 weeks after is currently 42

I ovulated 5 days ago very clearly according to my bbt..when can I expect AF?? 2 weeks??