Could i be pregnant?

So I had a miscarriage last month at 4 maybe 5 weeks I went and got blood work done and my levels at first were a 9 and then came back a 3 a week later so they confirmed it a miscarriage... fast forward to this month I am currently waiting on my period and my boobs felt sore so I took a test fully convinced it was going to be negative but it says pregnant which is confusing me... I don’t know if it’s still from the miscarriage or if I actually could be pregnant no period in between miscarriage and next pregnancy? If I am pregnant should I be worried that it won’t be a healthy pregnancy since there was no period in between ?

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