don;t worry too much when I was about 7wk and went to see Dr, the Dr also said my bb is smaller than expected by about 1 wk and there some blood around the 胎囊. he said the bb doesn;t look good and might be miscarriage too. He send me home and ask if see any blood, go to hospital immediately... I was very worry at that point too and nearly cry. I went home and try to rest more.. although there brown discharge from time to time but so far its ok.
I am now 13w5d already and went for scan last week. can see bb hand and leg moving around already
so not to worry to much and try to rest more
I sleep for 13-14hr each day for about a week during that period.
I had similar situation as you. But Dr recommond me to take rest and stay at bed around two weeks, also got injection to protect my bb. Now my bb is already 7 months old. So don't worry.