I have gotten two positive home pregnancy tests, then one negative at the doctor's office which he thought was just because it was so late in the day. I have gotten two more positives since then. My doctor did a blood test for my hcg and it was 134, I think I would be about four weeks. I did an ultrasound today and they said they found no signs of pregnancy. All of the pregnancy tests i have done have been since Wednesday this week. Today after my ultrasound I tested again and got another positive. I am pretty sure that I'm pregnant but it concerns me that they didn't find any signs of pregnancy on the ultrasound today.