My HCG levels have QUADRUPLED every 48 hours, and the nurse said today either this is a sign of a multiples pregnancy or a "non viable" pregnancy. She mentioned Ectopic, but said my progesterone is good so she doesn't think that's the case. I don't have any side pain or spotting. What are your thoughts on this? Anyone else have quadrupling levels and a healthy baby; single or twins?! Thank you!!