I had a very faint positive line on Monday at 10 dpo and an even fainter positive Tuesday morning at 11 dpo. All my tests since have been negative. I had a blood test yesterday at 12 dpo and it was also negative. Could I still be pregnant? Has anyone experienced a false negative blood test at that point? I am confused about the two faint positives and then all negatives after that. I have no bleeding or any sign of miscarriage yet.