Ttc #2 since July, this month in a dire attempt to lengthen my luteal phase (normally around 9 days) I started taking b vit complex around cd13... And have yet to have a positive opk... Now on cd20. Have just been reading that it can delay or even prevent ov due to suppressing oestrogen. Am now confused about whether to stop the b-complex (assuming I haven't ov'd) and wait it out, or to carry on taking and see what happens. Massively annoyed to miss another cycle... 