Confusing pregnancy


According to my lmp I'm 7w2d along..I have been bleeding for about a week and a half similar to a light day was a bit heavier but for a short period..I went to the hospital to have it confirmed by a blood test which was positive and my first hcg level was 52. My second one was 83...3 days later. I than had both abdominal and vaginal ultrasounds which both didnt show anything...I've had mild cramping here and there some that were a bit stronger..still have positive pregnancy test to this day. I had some pregnancy symptoms but they all are gone. I dont know what's going on and havent got any real answers.