Advice for postpartum period

Okay ladies I need some advice for my future TTC journey and postpartum period. We plan on TTC at the end of next year, maybe beginning of 2022. My new job I have up to a 12 week maternity leave period but it’s all unpaid, which will cause a bit of a bump obviously with bills, groceries, and baby necessities. I need advice on when to start saving and how much would you personally put aside each month/check for savings; also how many week would you personally take off, would you just take the 6 weeks to heal or push for the whole 12 weeks even if it means a tighter budget?