If you get paid maternity leave, what did you use to extend your maternity leave? Vacation/Sick day/Unpaid?

I can't go on unpaid leave since my income is the primary income. How much vacation or sick leave did you use? How did you decide how much to use and what to save for future?

I'm thinking of using vacation and maybe the ability to use sick days, but not sure. I usually use up my vacation each year, so maybe I'll stick with 8-12 weeks mat leave and save my vacation and sick days for when I'm back at work.