I am slightly annoyed to be honest. I called and told my coordinator that it's my understanding that progesterone should be given to bring on my next period. She said that they like to wait and see if the period will come on it's own. That's all well and good but if not for the internet, I would have never known that I might need P4 support. In addition, DH and I have been trying this cycle and I was unaware that i will not likely ovulate this month due to the mock cycle. She simply sent me on my way after she had my lining measurements and told me to call when I get my next period. Anyway..she is getting back to me tomorrow to let me know what the Dr says and when I should start progesterone. Thanks a lot for your advice and help.