I'm pregnant and having some complications any suggestions?

IN A WAY THIS MIGHT SOUND BAD BUT I'M GLAD THAT I'M NOT ALONE.
I WENT TO THE DOCTOR FOR BACK PAIN AND FREQUENT URINATION. ACCORDING TO MY LAST APPT. I SHOULD BE ABOUT 11 WEEKS RIGHT NOW. I HAVEN'T HAD A PERIOD SINCE AUGUST. THEY DID THE PREGNANCY TEST ( SO IT'S NOT TRUE THAT IT'S ALWAYS ACCURATE) NOW I WENT BACK FOR AN ULTRASOUND TO DETERMINE AN ACCURATE DUE DATE AND THEY DECIDE THAT MAYBE THEY SHOULD TAKE A BLOOD TEST TO BE SURE ABOUT THE HORMONE LEVEL BECAUSE THE ULTRASOUND DOESN'T ADD UP WITH THE FIRST DUE DATE THAT WAS GIVEN TO ME. THE BABY ISN'T AS DEVELOPED AS IT SHOULD BE AT ABOUT 3 MTHS IS WHAT THERE TELLING ME.

BACK IN FEB I ALSO WENT THROUGH SOMETHING SIMILAR NEVER GOT A PERIOD AND TOOK PREGNANCY TEST CAME OUT POSITIVE. NEVER BLED GOT ANY PAIN OF ANY SORT BUT WHEN I WENT FOR A FOLLOW UP THEY TOLD ME THAT I HAD WHAT THEY CALL A MIS-MISCARRIAGE ( IN THIS INSTINCE YOU DON'T BLEED RIGHT AWAY YOUR PERIOD JUST SORT OF COME BACK LIKE NOTHING HAPPEN
IF YOU DON'T PAY ATTENTION TO YOUR BODY