Am I pregnant or left over HCG??! PLEASE HELP

I had a 7 week o

ld miscarriage on may 6. Everything passed.

So 3.5 weeks ago

It was like a regular period only bled a week.

I've been getting nauseous most times I eat so I took a test and got a obvious positive.

Is this left over HCG?

When I had a miscarriage before and still had + a week later but barely noticeable by the time my period was supposed to come.