Happybaby I so hope your right that its the embryo that has caused my immune system to go down. Guess we are all starting to get nervous now cause the countdown is on. My normal AF is due to arrive this week but I know that with taking the pressaries it will be delayed. I also know that the last two cycles I have made it all the way to the BT but still got a BFP. The first time I was so excited cause i thought well AF hasn't arrived and its been 14 days only to be told that the pressaries etc can delay AF. Why does it have to be so hard. If this cycle doesn't work I think I will get tested for celaic disease saw on current affair last night that this can cause unexplained infertility I have had every other immune disease test so I figure one more cant hurt.