Hi! this is my second (well, I guess third) pregnancy and I'm worried that something isn't right. based on my LMP I should be 7 weeks along but I'm only measuring 5+1. when I went for the ultrasound they could only see the sac.

has this happened to anyone else? I've been spotting the entire time with this pregnancy, but no really heavy bleeding. I had a chemical pregnancy a few months ago so I'm really nervous this time.

any idea why this is happening?