Pregnant after one normal period post miscarriage ??

So I’ve just had a positive pregnancy test after a complete miscarriage at 7.5 weeks on 22nd February. I had my period return 4 weeks after bleeding subsided and am due again in a few days. My HCG levels went down to 6.1 on 7th March. Surely this isn’t HCG still in my system? 2 strong looking tests but so hard to not be second guessing. Anyone have any experience with this?

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