Can I request an HCG test?

I had a miscarriage 2 years ago and this is our first pregnancy since.

I am so concerned about losing this one too. I want to ask for an HCG test, but don’t know how to go about it. The first OBGYN I called and requested said they don’t offer appointments until 12 weeks 😥. I am just so confused because I see other women talking about their HCG levels