well, it depends on what sort of model the hospital offers & you choose. some people do 'shared care' where they keep seeing their GP & also have some hospital visits.

for me, i only have hospital visits because my GP isn't accredited to do shared care with my hospital. i started off with visits once every 4 weeks but as i have high blood pressure & GD, i go once a fortnight - i think the visits go from once every 4 weeks down to once a fortnight around the 32 weeks anyway.

that may all depend on your hospital though - when you go for your initial 'booking in' appointment, they should give you a pack of information about the particular hospital & will talk with you about things like frequency of visits, as well as your medical history etc.