You do not need progesterone anymore. In fact, we probably overtreat with progesterone by going out to 8-10 weeks. There was a study from Denmark several years ago where they compared pregnancy rates in IVF cycles between patients who stopped taking progesterone as soon as they knew they were pregnant, to
womenWomen's way who took progesterone until 8 weeks, and there was no difference. The placenta takes over progesterone production between 6-8 weeks, so at 11 1/2 weeks you should be free and clear. At this point, taking a shot of progesterone is somewhat like dumping a pale of water into a bath that is already full. I think your are in good shape at this point. Good luck!