Am I really having a miscarriage or is something else going on?

I AM 36 YEARS OLD AND HAD A TUBAL LIGATION ALMOST 6 YEARS AGO AFTER HAVING TWO VERY EASY PREGNANCIES AND TWO BEAUTIFUL BABIES.  RECENTLY MISSED MY PERIOD AND BEGAN HAVING PREGNANCY SYMPTOMS.  TESTED POSITIVE ON JAN. 3RD AND BLEEDING ON JAN 4.  DOCTOR COMFIRMED THE PREGNANCY ON JAN 5.  HE DID AN ULTRASOUND AND SAID I WAS NOT VERY FAR ALONG BUT IT DID NOT LOOK LIKE A NORMAL PREGNANCY.  HE SUSPECTED A THREATENED MISCARRIAGE OR AN ETOPIC.  HE DID HCG LEVEL BLOOD TEST AND SAID COME BACK IN 2 DAYS.  THE TEST READ 70.  THE SECOND TEST DID NOT GO DOWN AS HE SUSPECTED BUT ONLY WENT UP TO 76.  I STOPPED BLEEDING ON JAN. 7.  AM I WAITING ON A MISCARRIAGE, ETOPIC, OR HEALTHY BABY.  I'M GOING CRAZY, I NEVER REALIZED I WANTED ANOTHER BABY UNTIL I FOUND OUT I WAS PREGNANT.