Chasteberry, spearmint and saw palmetto might increase pregnancy times. Chasteberry and spearmint increase LH. Saw palmetto and chasteberry reduce prolactin. Prolactin and progesterone delay menstruation from starting. LH and FSH are functions of the follicular phase.
Even if a herb that extends the luteal phase is used, its still playing roulette, because it may not always work out always as expected.
Even if a herb that extends the luteal phase is used, its still playing roulette, because it may not always work out always as expected.