for some people, the lining will actually reabsorb over time as there isnt' enough shed to cause a bleed

for me, my endometrium doesn't build up much between bleeds as i don't have regular hormone levels due to the pcos - so when we want to start an AC cycle, they have a blood test done to see if i have a similar hormone profile to someone who is in the middle of AF - and i have had every time...