progesterone test

Hi guys, I got my progesterone level tested yesterday on cycle day 23. My Dr. emailed me my results 7.9 and she said it's a bit low. She wanted me to retest in a few months. I emailed her back asking if that meant that I didn't ovulate she said it's inconclusive and that's why she wanted me to repeat the test. Can anyone share what could this mean? Did I ovulate or Not? Did anyone have a low progesterone level and conceived that cycle?