Are postnatals safe to take instead of prenatals in final days/weeks of pregnancy?

After birth I plan on taking postnatals (instead of simply continuing prenatals). It helps with breast milk production on top of making sure I’m getting all the nutrients I need (and the baby) which is why I’m opting for that instead. I’m 36 weeks, due March 14-18, but I only have like 10 prenatal vitamins left. I don’t want to buy another two + month supply when realistically I’d only need less than half of them before switching to the post natal (and yes I want to start the post natal right away after giving birth). I also don’t want to stop taking the vitamins in those final weeks. I’d like to just start taking the postnatals if I run out before giving birth, but is that ok?

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