MWL, I haven't had a transfer on a stim cycle, so I don't really know what it does. My sad tendency to hyperstimulate has ruled out transfering both times.

But, my last FET cycle was the exact situation you described. AF arrived right on cue with spotting the day before blood test and heavier bleeding the day of the test. I knew it was going to be negative. What I wasn't prepared for was what happened the next day - AF being so suddenly and unusually painful that I could not stand up... Extremely heavy, but it was the pain more than anything else that got to me - I felt like my uterus was being torn out of my body. My blood test revealed a HCG level of 1.2. Extremely low, and I'm sure that if my test had been a day later, we'd have been puzzling forever about the significance of my unusually painful AF. I had no huge clots, though... I did have a lot more clotting than normal, and many much larger than normal, but nothing like what BG and yourself went through.

It's so hard to know for sure what happens in this game. In some ways I do feel better that we (my DH and myself as well as my FS - that was important to me for some odd reason) were able to acknowledge it as a lost baby... and that we can sit and think that two transfers have given us two pregnancies... we just try so hard not to think of the two miscarriages that followed.

Other times, I wish I'd never known and was just able to think of it as an unusually painful AF, and not the loss of another precious angel.

Anyway, excuse my babbling, but I do hope that it helps you to know that there are many of us who have been where you are right now. That's the beauty of belly belly - the fact that it brings together those of us who are going through an extremely isolating experience and gives us the gift of understanding and the support of other women (and men - sorry Slyder!) who know what it's like.

Hang in there.

BW