You must inform your employer about your pregnancy by the 30th week.
Immediately after the start of your maternity leave:
- 
your polyclinic will issue a medical certificate of incapacity for work from that day on,
 - 
you will submit it to your employer,
 - 
based on that document, your maternity leave will be formalized,
 - 
after which you will receive your maternity allowance.