Blighted Ovum Experiences?

Sa

At my 5 week scan everything looked normal, nice size sac etc. Currently 7 weeks, started cramping painfully, and suddenly felt something in my undies. I rushed to the ER as my OB told me to do incase of bleeding, they did a transvaginal and couldn't see anything. By now they should've had a fetal pole or anything, but empty sac. And the sac didn't look as round and spherical as before.. I did an HCG test which gave results of 10033.82 mIU/ml. They said its fine for now, but the hcg ill get done in 48 hours will determine the outcome. Anyone have similar experiences? Please share whether it ended positively or not so great. Thanks in advance ladies. Could it possibly be a blighted ovum?