Maternity leave advice

So I work 40 hours a week at a retail job (standing constantly). My due date is in a little over 4 weeks. I am getting so exhausted! I feel like my baby has dropped even more the past couple of days. I'm thinking she could come anytime in a week or two. I am not getting paid for my leave so I dont know if it would be worth taking a leave early or not 😩 I need advice!!