Congrats - perhaps it was too early to see anything on the bloods, seems strange though that if the spotting was implantation that you did not get a reading on the bloods - especially a week after the bleed. Perhaps it was just a break through bleed for when your period would have been due.

I can't figure out your dating, you could be anywhwere between 4-7 weeks - guess you are going to have to get an ultrasound to date the bubs