Okay so I had an ultrasound 3 times this week and all times all they saw was gestational sac no fetus or yolk sac nothing so I am assuming I am about 4 weeks I got a positive pregnancy test jan25th idk when my last menstral cycle was so I'm really lost. My hcg level was at 2000 Monday and at 4,000 (today) is that normal for that early on. Everyone keeps suggesting twins or that I'm furthure along then I thought but if that was the case wouldn'tiI see yolk sac by now or fetus? As expected about 5.5 w -6