yes. My last cycle was 42 days. The cycle before was 39. I was on progesterone for the first time last cycle and as soon as i got my Beta results Dr. B told me to stop the progesterone and he'll see me in a couple of days. 2 days later AF showed. So it was definitely the progesterone.
It has to be the progesterone. Last cycle, once I got the negative beta Dr B told me to stop the progesterone to get AF. In general, progesterone is prescribed to correct any luteal phase defects. .