With my first, I was over 10 weeks when I got my first positive test. Blood tests and everything were coming back negative. But I had an ultrasound at 8 weeks, and he was definitely in there. Of course, that is entirely not normal. But testing before you're supposed to get your period can definitely give you a false negative. I'd take another test first thing tomorrow morning.
at 4:47 PM on Mar. 21, 2009