My levels arent doubling like they say that they should be. My last four numbers were 5, 23, 27, and 36 each where 48 hours apart. Im not having any pain, Ive had one transvaginal U/S and nothing is showing up in the uterus or the tubes, but my levels are still rising. Im not sure what I should do. we don't know how far along I am they think it can be too soon to see anything in the ultrasound.. can anyone please help me on this???