I'm having the exact same dilemma. AF started for me on the 21st this month too which would give me the same EDD as you, 12/26. I'm just not sure if I'm okay with that or not. It will be my first and I dont' know...I"m just torn. Part of my wants to start trying right away but part of me wants to also wait until next month. We got pregnant right away the first time, and I know that it may not happen this way the next time...I don't know...I just reallllly want to be pregnant. I guess maybe that answers my question??