You should go to your gp before 12 weeks. At least once in the first 12 weeks is important.
Your gp will discuss obstetritions, ante natal clinics etc with you. Discuss which would be the way you want to go.
Maybe do a pee test. Maybe a blood test. Not deffinetely though.
They should send you for a dating ultra sound which is best done before 12 weeks.
He/she might do blood pressure & weight checks or they might leave the weight for the ob. I only got weighed once my last pregnancy when I booked in at the hospital.
There aren't usually internals done, it's more ultrasound these days.