Implantation bleeding & embryo measuring small

Hi mummies. I went for my first check up on the 26th March and I was measuring 5 weeks and 5 days. My next appt was supposed to be 10th may. However I started implantation bleeding yesterday so we immediately rushed to the doctor. Was given the hormone jab and hormone pills. Doctors also said that the embryo was not measuring the right week supposedly 7 weeks but I was only measuring 6 weeks and 1 day. Was sent home on 24 hour bed rest and doctor said try not to walk around too much. I’m still super worried... any mummies that experienced the same thing?