Was having a bit of cramping (No bleeding) so my Dr. ordered an ultrasound to be sure not ectopic. Saw gestational sac but no embryo yet. Sac measured 5 weeks 2 days instead of the 7 weeks I thought I was based on my LMP. Dr said everything looked perfectly normal for a 5 week pregnancy but I'm worried that I'm 2 weeks behind where I thought I was :/ Any idea why this might be? Has anyone else gone through this with a positive result??