Should I be taking extra Folic Acid when pregnant with fraternal twins?

I am currently just taking one prenatal a day, however I just read a convo on here and it seems a lot of women take more than just their prenatal? I take iron but thats because I blacked out my whole first pregnancy from low iron so I automatically put myself on it. I see a dr Monday for my pre natal appt and will ask but I’m almost 3 months and wondering if this was something I was suppose to be doing the whole time and nobody told me? Or if it’s only in certain cases that they want certain people to take extra folic acid? Will it hurt to take too much folic acid? I’m at a loss. I can’t switch providers but I don’t feel I’m understanding anything having to do with my babies. Sorry to post on here I’m just very confused :/ thank you so much in advance