When to schedule my first appointment?

Jessica • ⛪️ + 👫 + 👶 + 🤰 = ❤️
So I already confirmed my pregnancy with a blood test at my general practitioner. When do I set up my first obgyn appointment? My mom said there's no rush because even if something was wrong, it's too early for them to do anything. I'm currently only 4 weeks.