I had a vaginal ultrasound today after having on off abdominal pains and a visit to a&e last week. I am testing pregnant, have lots of physical symptoms, they checked ovaries and tube in case of ectopic. My hcg levels have doubled from 900 to 2000 in last two days so they expected to see at least a sac even though I am only 4+4. Having seen no sac but womb lining thickening and closed cervix they said perhaps the pregnancy just has'nt taken and I should perhaps prepare to miscarry. Have to go back tomorrow for more blood tests. My question is (sorry for going on) has anyone had high hcg levels, had nothing show up on an early scan and go on to have a viable pregnancy? Sorry but the 'just wait and see' is agonising.