Maternity Leave

Hi mga misis! Ask ko lang I am only 6 months pregnant and so far ok naman ang pregnancy ko. Pero my work is a 4 hour daily commute and this is my first successful pregnancy, I had miscarriages before pero ito lang ung umabot ng 6 months. Do you think its adviceable na I take maternity leave already? Or is it even allowed? I understand naman na maaga akong babalik sa office in this case pero I am willing naman to take unpaid mat.leave if ever. Thanks sa sasagot