B complex?

I have 800 mcg of folate (B9) in my prenatal, but I was wondering if it would be okay to take an additional b complex vitamin? I’ve heard that extra b6 and b12 are good for circulation and they can help with nausea, but I wasn’t sure if I can take an entire b complex vitamin in addition to my prenatal, or if b complex has too many other extra vitamins (like extra niacin, biotin, etc).