If you want to confirm your pregnancy you can make an appointment with a doctor or midwife at a medical centre of your convenience. The degree of contact you have with your doctor throughout the pregnancy period will vary according to which region of the country you reside in.
You are free to select a gynaecologist of your choice, and there are plenty of organisations for those looking for help when it comes to choosing a gynaecologist, such as the French-speaking ONE (Office de la Naissance et de l'Enfance), Dutch-speaking K&G (Kind en Gezin).
For more information about this:
Kind & gezin: http://www.kindengezin.be/
ONE: http://www.one.be/