Ulterasound not show abt pregnancy...?????

i had period on 27th nov-09 only for one day...after that on 11th dec-09 in the morning i had some bleeding like some pink spott...so i decide to check my pregnancy it light second pink line...after that i test again 13th, 16th so it much clear second line..that mean i am pregnant..so my doc. advise to ulterasound on 19th dec-09 but my ulterasound show that my uterous is swallon so much..& doc. said that pregnancy could be on tube...i am very worried abt that...doc. advise to take progesterone-200 tablet for 10days & again ulterasound on 30th december bec my due date is on 27th december...so pls give me some advise ....so i take relax..pls...