Dx with abn. preg. 8w no baby in 5w6d sac. given cytotec (misoprostol) passed several clots, gray tissue, but don't know what a large solid mass was size of 50cp. ?

Tissue: This sounds like normal tissue and, since there was no fetus seen but still a sac, you can expect it to be fairly informed in appearance when the tissue passes. Remember, as unfortunate as this is, it was not due to anything that you did or didn't do and was beyond your power to have changed. So many things have to go just right at just the right time to have a normal baby, each is a true miracle.