I am a patient of Dr. Che.ck. We did an IUI in June and one week later they did a lupron shot. We did end up with our first BFP, but unfortunately we did not get a h/b and miscarried. In previous cycles we were just doing TI and no Lupron. I recall the nurses saying that they were starting to do Lupron shots and they were surprised I didn't get one the previous cycle.
I am not sure if our brief success was due to IUI or Lupron, or both. Unfortunately, I do not know how it works. I did end up doing PIO injections due to low progesterone (even w/supplementation), and thought I read somewhere that the Lupron may have played a role in that.. but not sure. Even so, as much as I hated the PIO, if Lupron helped with the BFP, I'd take the tradeoff.
Best of luck to you