My beta today was 2406 I had miscalculated when I thought it should be above 4000. I entered my numbers in a doubling calculator and my doubling time is 38 hours. The fabulous news is I GET AN ULTRASOUND TOMORROW!! Since my last pregnancy was ectopic, she said my numbers are high enough to atleast be sure the embryo has implanted in the uterus. my numbers sound like singleton numbers but maybe I will get a suprise!