Should I take magnesium w/my prenatals??

Melissa💗 • Rainbow baby born in 2016, then another miracle born in 2018! 🙏🏼 Currently just found out pregnant with baby #3! Fingers crossed all is well! ❤️
So I got some blood work done today for my progesterone levels and the lady helping me suggested I take magnesium. I figured my prenatals I take had it, but when I got home and checked I found out that it in fact does not..
So, would it be fine to start taking the magnesium pills along side my prenatals? 
I will of course ask my doctor but was curious if anyone else does this? 
Thanks for any help or friendly advice! :)

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