I just did my first ultrasound today. I thought that the baby was 8 weeks based on my lmp and the ultrasound age is 5 and a half weeks. The clinic took my blood to look at my hcg but didn't explain anything to me. I don't know what to think. is this a missed miscarriage? was the time wrong? how could it be that different? i know that i conceived the child 5 weeks ago and i was positive on the pregnancy test 3 weeks ago. the math doesn't make sense to me. can someone help please?