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8 week ultrasound accuracy

went to the doctor because I thought I could be pregnant despite having all my periods for 3 months,(I'm on birth control and didn't know if it was possible to still have a withdrawal period if you got pregnant on it or not.) and negative blood and urine tests. I just felt weird and thought that I was prego! I know it sounds crazy, but I'm overly paranoid. So, she sent me for a transvaginal ultrasound and had the tech give me a little anatomy lesson. She showed me my ovaries, the lining of my uterus and even where a baby would be if I were pregnant. So, I felt better when my doc told me that there was no baby there and put me on birth control. Well, now I'm being overly paranoid again (nothing unusual!) because I didn't tell her that me and my ex (we were still dating at the time) were messing around and he wanted to have sex but I didn't, but he stuck his penis in me anyway and I pushed him off! The doc sent me for a blood test the day before the ultrasound and it was negative, and I would have been 8 weeks from the incident in which a pregnancy would have happened. My question is, could they have missed a baby at 8 weeks pregnant on ultrasound. Wouldn't the tech have at least seen a gestational sac? I know the chances are slim, but please help me ease my mind! I've had all of my periods also, they've just been lighter. Any help would be appreciated!
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replied March 28th, 2009
absolutely no
There is no possible way the doctors would miss an 8 week pregnancy with an ultrasound especially. I am 8 weeks and the ultrasound would show a little black ring and a white form inside of it. And you would DEFINITELY know if you were pregnant by 8 weeks because you'd probably be getting sick and your breasts would be larger and in lots of pain. I found out simply by taking a store-bought pregnancy test and it showed positive then I followed up with a doctor's appointment even with doubts. It was only confirmed.
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replied August 12th, 2009
A blood test called a quantitative BHCG, meaning a pregnancy test detecting a specific level of HCG, the pregnancy hormone, would have produced a level greater then negative. Ultrasound would have detected if a IUP, intrauterine pregnancy was present and at this stage a cardiac heart beat would have been seen. Even if you were pregnant outside the uterus, say in a tube or in the adominal cavity the blood test would prove it.
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