MTHFR gene?

My sister in law had a miscarriage earlier this year and her doctor suggested she test for this abnormal gene, it makes it so your body doesn’t process folic acid which is essential for pregnancy. She ended up having it and switched to a more finely processed folic acid (something like that?!). I found out tonight that they had my biological brother tested for it and he also has it. Meaning he got the mutation from both of our parents. No one knows I am pregnant and now I’m all freaked out that I have the mutation and am not getting folic acid! Anyone else have this ? How much and what kind of folate are you taking now that you’re pregnant? I’d rather be safe then sorry. Thank you!