35yrs 1st pregnancy hcg 45,000 vaginal ultrasound no heartbeat lmp made me 5weeks 5days i believe conception date made me 3weeks 6days am i doomed?

Not necessarily: Usually we see a fetal pole by the time the HCG reaches 10, 000. However, 5 wks 6days is right at the cusp of being able to visualize an embryo. I would reserve judgement until you are a week or so further along, but be prepared for miscarriage. There is also the remote possibility of twins or a heterotopic pregnancy which could raise the HCG level prior to the ultrasound detecting a fetal pole.

Pregnancy early : HCG levels gradually increase during the first trimester.it increases by 60% every 2-3 days. The range of levels for each week of pregnancy is large and depends the number of embryos that are growing , in addition the health of the embryos. Around 6 weeks of pregnancy the value range from about 1000 to56,000.The heart beat is seen by vaginal ultrasound by 61/2 to 7 weeks. Fetal pole is seen