Do High Levels Of HCG Indicate Pregnancy?

I HAVE HAD 6 MISCARRIAGES IN THE LAST TEO YEARS. I HAD A POSITIVE PREGNANCY TEST ON THE 27TH JANUARY IVE HASD A SCAN BUT IT WAS INCONSLUSIVE SO HAVE HAD HCG BLOOD TESTS WHICH WENT FROM 3841 TO 6598 AND NOW IVE HAD A PROGESTERONE TEST WHICH CAME BACK AS 37 ARE ALL THESE GOOD SIGNS OF PREGNANCY LEVELS ? AND DOES IT SHOW A HIGHER PERCENTAGE OF KEEPING THIS PREGNANCY ?