If I last had sex on September 23 and had a transvaginal ultrasound on November 17 and didn't tell the doc or tech that I could be pregnant, would they have found at least a gestational sac without looking for it? I would have been almost 8 weeks at the time of the ultrasound, and I also had a blood test come out negative the day before the US. I'm on the pill and haven't missed a period, but I'm not sure if you would miss a period while pregnant on the pill. The doc ordered the test because I was afraid I was 3 months pregnant and the preg tests weren't picking it up! (CRAZY I know!) But now, I'm getting paranoid again! The tech did show me where a baby would be if I were pregnant, and there was nothing there that I saw and she also said the lining of my uterus was thin and she could tell I had just had a period. I didn't tell the doc because I was worried about the earlier incident thinking I was pregnant from earlier on and the guy was only in me for a 30 seconds and then we quit and he didn't ejaculate inside me. I know this is crazy, but I would like some answers to ease my mind!