Yet another mtx question

I’m starting mtx this weekend. And my rhumey has also prescribed folic acid to take the other days. Should I start the folic acid before I start the mtx or wait till after?

I would probably start it beforehand, but I'm not sure it's necessary to do so.

I asked my doctor if I could start folic acid before. She wasn't against it and said if it made me fell better starting beforehand, go ahead. So I did.