Thought I'd chime in.
i conceived with a short cycle last october (24days)
i believe i had a late implantation (I cramped the day my period was due ) or just a short lutheal phase and ended in misscarriage at 9 weeks , i really believe it was my short cycle /LP that didn't let the embryo implant properly(i might be wrong).
i was diagnosed with low AMH and extremely vitamin d deficiency.(live in the north and work indoors night shifts)
After my miscarriage and supplementing with vitamin D my cycles went to 28 days again and my lutheal phase corrected itself.
my periods are now heavier and longer too , and have no spotting before AF. (there was a point that i was spotting 2 days before my period and AF was very short and light.)
I been researching and vitamin D seems to play an important role in fertility and AMH.
I just turned 38 .
Love and dust
Alita
i