It's called Beta HCG. I know how nerve-wracking waiting for those numbers can be, especially if you've had a tough journey, but it's the best way to get a clear answer.
It's called the Beta HCG blood test. You can easily book a home collection in the morning and get the reports online by evening so you don't waste time going to a clinic.
During my early days, I had to get the Beta HCG test done twice to see if the levels were doubling. It's a quick blood draw, barely hurts, and is much more reliable than home kits.