Do you get to do ultrasound scan at every visit for Govt Private?

I am on subsidised govt route at SGH and I learnt today that I won't get to do ultrasound at every visit. There will be a detailed scan at week 20 and then will have to wait till week 32 to have the next ultrasound. In between even if you request, they will not agree. Just wondering if I switch to private govt, will I get to do ultrasound at every visit?