Girls, can you tell me the process of registering for pregnancy? In ge…

Girls, can you tell me the process of registering for pregnancy? In general, what's the question? You write a statement and everything, and you formally stand or how? The point is that I was on maternity leave from the beginning of my pregnancy, and now it's not recommended by the doctor to go to work, but you need to register (but they don't register you while you're on sick leave!). So it's like that... so I want to know the deadlines.