Good afternoon, pregnant ladies? When should you register for antenat…

Good afternoon, pregnant ladies? When should you register for antenatal care? And what should you bring with you? Also, do you need to have any tests done? I have an appointment with my private doctor on 21.05; I'll have the tests then — by that time, insha'Allah, I'll be 12 weeks. Or should I go to register right away with those test results so I don't have to repeat tests multiple times?! ?