I am 5 weeks 2 days and I had an U/S yesterday that showed no sac. My HCG was tested and I was around 630. The doctor expressed concern of either an ectopic or chemical pregnancy. This pregnancy occurred after my first IUI w/out meds as I have one blocked tube. I miscarried last January at 11.5 weeks. Any advice? Any chance this is still viable? I have an adorable 3 y/o and had no problems conceiving and carrying her to term...but, I am now 38. Thanks!