Is this bad? Help please?

So I'm taking a multivitamin at the moment. And I was told I have to take a prenatal for the extra folic acid. Well I bough this thing of chewable prenatal. It says to chew 2 a day. I was thinking sense my multi vitamin has 100% of my folic acid and my prenatal it takes two of them to get 100% of what I need. There is only 60 prenatal so it would last me only 30 days. My question is wouldn't it be the same to take my multivitamin and just one chewable? It would save me money by making them last longer.