HPT. Positive to negative blood test ?

When you get a positive it’s always best to test again a couple days later because it may not be there like in my case two days later after these results because the line is faint I wanted to test again not knowing that the faint line was the levels and that it was actually luckily the last levels and I was lucky enough to catch them . At 5 weeks and 6 days I miscarried . It was weird because I felt so connected that I wanted to triple check at the hospital with a blood test today with negative results I am in denial but I know it’s true you can miscarry this early I want to know why but I don’t . I just want most women to know that a positive is good but just keep checking because you can have a Miss Carrie and not even know it in my case I felt it and I was like enough to know it was there instead of not knowing I wish everyone the best of luck I will be trying again soon I still have not had a period and I do not know why so I will be seeing my OB/GYN this week to keep you all posted with help and maybe another reason I am guessing the positive with the faint line was just a sign of low HGC levels and loss