When to apply for Hospitalisation leave before delivery?

Hello! I am currently in my week 34 pregnancy and would like to find out usually when can I request for hospitalisation leave from Gynae? My job is rather stressful and I have been feeling so tired recently (currently working from home). If my Gynae can’t give my Hospitalisation leave, when is the best time for me to apply for annual leave before delivery? I’m planning for a natural delivery so not sure when is it too early to take annual leave. Thanks #advicepls