AF arrived last night after a BFN on Thursday. I may just be insane but today I bled out what looks like a little sac with a string attached, about the size of my thumb nail & the string is about 1/2 in long maybe. I've had clots before that were jelly-like but this is solid mass & really stood out on the maxi pad. It's sitting in a piece of t.p. in the bathroom; I'm tempted to call my doc. IVF #2 was negative & if I didn't know better I'd think it was a m/c. I've never had a m/c of course so how would I really know? I had a chemical back in 2009 but never had anything weird; just a very painful period.