when do you see a sac

I THINK I AM PREGNANT; HAD TWO PREGNANCY TEST AND BOTH WERE POSTIVE; I HAD AND ULTRASOUND TODAY AND THEY COULDN'T SEE A SAC.  WHEN DO YOU SEE THE SAC

[KM604]

It may be too early.  I didn't my first u/s done until I was 8 1/2 weeks so we were obviously able to see everything.  I think at 5 weeks you should be able to see something.

[Kim1989]

well maybe you have an etopic or something. or maybe you just found out really early but i took a pregnancy test and within about 3 days had a doctors apointment and an ultrasound and we saw a sac and a dot. and that was somewhere within 5 weeks.

when was your last period. maybe your just really really early on

[heatherlynn22]

i didn't see either boys sac until i was 9 weeks.

[Alice78]

My situation is strange...1.5 years ago i was pregnant and my hcg levels were not doubling and we could not see a sac. It was ectopic pregnancy and i lost my right tube.
This May i was pregnant again and my hcg was doubling fine but again no sac at 6 weeks so the doctor said is ectopic again and i had a surgery.
Now i am pregnant again!!!! (changed doctor) and told me that if the hcg levels are doubling it means the pregnancy is going well, so i now think what was the second then?Maybe my previous doc should have waited longer for the sac?Now my hcg is great and i have an appoitment on Friday at the doc!Hope all goes well.
Does anyone have similar situations?

[ebogilmo]

You are right your doctor should have waited a little longer as longas you were not bleeding or in any pain.. I have the same situation my hcg level was 3600 up from 530 after 5 days... so hcg levels were rising on time.. the er tech said she saw nothing at all just the cyst on my left ovary nothing in my tubes... I was soooo upset.. when I got home and my doctor called he said the doctors notes were that he did infact see something in my utrerus a tiny sac... but it was small for what it should have been.. well my doctor laughed and said not true your only 4 weeks and 3 days  and that he didnt want me to go back to the Er unless i was in excrutiating pain or bleeding... I agreed that they did not prove it ectopic and he did not jump to making any false conclusions.. in fact he belives they saw something but its just to early to write it off...so tell her to wait if she is not in pain..and even sometimes if she feels a lil achy it could just b the cyst that is keeping the pregnancy going..