Please tell me, I need to go tomorrow to apply for maternity leave acc…

Please tell me, I need to go tomorrow to apply for maternity leave according to the labor code. The gynecologist asked me to bring an employment certificate, but they don't know what kind of certificate I need. I can't call my doctor right now. Maybe someone has had this problem before, could you please tell me what kind of certificate they need besides my passport, ID card and insurance?