I've been taking vitex too, and B6, and my last cycles were 33 & 34 days Pretty good considering they used to be 28 & 29! Did not expect it to lengthen my LP that quickly. I feel like my libido is finally coming back too, after a bit of a hiatus. Hopefully that means my body will react in kind!
But yes, that's a big positive OPK, so get BDing!!