Vitamin B6 for infertility?

Has anyone else on here heard to take vitamin B6 to help with infertility? I read it in a book called 'The Impatient Woman's Guide to Getting Pregnant' ( Cause let me tell you 5 yrs into this I'm starting to lose my patience here). Anyway... So I've been taking it and my period is now WAY off track. Several days late (not pregnant) and when I do get my period it's lasting almost 2 weeks (usually lasts 6 days) Should I just quit taking it? Let my body get into a new 'norm' and continue to take it?

Help please:)