UK - why the early appointment?

Suki⭐️
Hi All!
So I have registered with a new surgery today as my GP has moved and I'm following her to her new practice.
I took my registration form in today and said I was 5 weeks pregnant and need to make my first apointment - should that be at about 8 weeks, I asked. 
The receptionist said no and I could see the GP this week.... 
So my question to you lovely ladies is : is there even much point at this early stage? Will I have to see her again in 3 weeks anyway?
Thank you ❤️