Is 500 mg of calcium a day enough during pregnancy?

Gabriela • First time mom. 23. Due 06.26.17
My prenatal Vitamin don't contain calcium. 
So I bought a calcium supplement that had 500 mg 
Is this enough? Do most Prenatal vitamin have this amount of calcium? 
Thanks!
P.S. I am lactose intolerant so I don't really get Calcium much in food. 

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