When did everyone first see the yolk sac and hear their baby's heartbeat? I'm only 5 weeks but had my first scan today due to severe abdominal pain and they couldn't see anything in the gestational sac or hear heart beat which sonographer said was normal at this time. I then had my third blood test and my HCG levels were at 3500 (has been doubling normally) but Nurse called to say they should have seen something in scan with HCG levels that high so my pregnancy might not be viable. Next blood test on Monday but now am panicking!