When are you taking maternity leave? (If you have 12 months)

An

I can’t decide when to start my maternity leave. I’m in Canada so I get 12 months. Everyone tells me to stick it out as long as I can but I’m already in a lot of pain (23 weeks). I was considering starting 8 weeks before due date + my three weeks vacation which would be I’m off as of the end of April.