Girls, is it mandatory to be on prenatal care and what does it give be…

Girls, is it mandatory to be on prenatal care and what does it give besides their own health and the baby's health? From a legal perspective, for example. I want to be removed from the registry of the local clinic and switch to private clinic at the third trimester (as far as I know, this isn't considered a record, but just observation and I'm not counted anywhere). And another question, I want to have a free birth then under OMS, just then go to any maternity ward with fights? I would be grateful for a detailed answer ?