I had 3 faint positive urine tests, 1 cheap dollar test, 2 FRER. I went to the ER for cramping, brought the tests with me, the doctor confirmed they were positive and did a blood test and a transvaginal ultrasound. The blood test was negative but the paperwork said Transvaginal Pregnant Uterus. They said there is a difference between non pregnant and pregnant uterus. I didn't know that But okay. He said that it could be that it's too early to detect in blood, I asked him how that's possible when it showed up in urine he said everyone is different and blood HCG and urine HCG are very different! He said it may take more time for it to show in blood work. We are unable to confirm if I am pregnant or not. They said by the time frame I would be about 3 weeks and the baby will not be viable by ultrasound until at least 5 weeks but my uterus showed signs.