first appointment today and not great news.

Had my first doctors appointment today and got to see our baby for the first time and instead of it being one of the best days ever, things don't look so great. Supposed to be eight weeks and judging by the ultrasound size it's measuring five weeks and five days. Heart rate is only at 60 beat per min. They are sending me back next week for another ultrasound. Has anybody else had this kind of problem with their timing and measurements not adding up? I am really starting to freak out!! The doctor said she is not ready to confirm that I will probably miscarriage but is not ready to say everything looks great either. Let me know if there's anybody out there that could be in the same spot I am so I don't feel so alone.