GreenOrchid - So sorry to hear about the endo. I am shocked that an ultrasound can show endo! As of right now we are in the "unexplained" catergory, but our RE wants me to go for a laproscopy to look for endo, I am hesitant because it is an invasive surgery...I will be interested to hear how things work out for you. My RE also told me that as long as my temp stays up then the spotting shouldn't matter...I guess they are the doctors they know. 
TeddyBearPug - I also took the progesterone for the spotting, and it didn't help at all. I have heard that clomid is supposed to help with short LP, however it seems that most of us don't have that issue, we just have spotting. My last cycle of IUI they tested my progesterone on day 21, the same day I got AF, they called to tell me the results - my progesterone level was "awesome" and showed that I had a really good ovulation
....So what's the problem then?!
My acupuntrist is also a nutrionist and she gave me some suggestions on how to cleanse the liver to help get rid of excess estrogen, I am going to try that also, see if that will help.
About bcp, my RE told me that the bcp shouldn't cause changes to your cycle but it can mask changes that might happen naturallly...so who knows.

TeddyBearPug - I also took the progesterone for the spotting, and it didn't help at all. I have heard that clomid is supposed to help with short LP, however it seems that most of us don't have that issue, we just have spotting. My last cycle of IUI they tested my progesterone on day 21, the same day I got AF, they called to tell me the results - my progesterone level was "awesome" and showed that I had a really good ovulation

My acupuntrist is also a nutrionist and she gave me some suggestions on how to cleanse the liver to help get rid of excess estrogen, I am going to try that also, see if that will help.
About bcp, my RE told me that the bcp shouldn't cause changes to your cycle but it can mask changes that might happen naturallly...so who knows.