I just got my first ultrasound. I Thought I was 7 weeks based on my last cycle, but she said I only looked 6w4d. We saw a little heartbeat and she said everything looked normal; 136bpm, but my little bean is only a half a centimeter, or 5mm. All my apps are telling me he should be bigger by this time. Any personal experience? I've been having a TERRIBLE time keeping ANYTHING down and I'm worried I've done something to stunt his development already, is this possible at this point that I've done something to make him smaller? Is this normal? I'm totally freaking out....