gestational sac too small for size

I am around 6 weeks pregnanct and was having right sided pain, so my doctor did a quick scan for me and I did see a heartbeat.  She did say she was "concerned" because the sac should be larger than it was.  I have looked for information on this and have not found much helpful info.  She told me my chances of it all being ok were 50/50. Any advice?

[sweetangel7]

Perhaps you are not as far along as you thought...maybe you ovulated later in your last cycle and therefore you are 4-5 weeks rather than the 6 weeks you thought.  Not much you can do other than try to stay positive and wait for your next ultrasound which I would assume would be in a week or 2 to follow up on the situation/your doctor's concern.

[Rachelley326]

I thought the same thing, but I ddin't think you would be able to see a heartbeat that early.  I could clearly see the flicker, but she used a pencil to show me how big the sac should be and it was no where near what she was pointing at.   I also have a retroverted uterus so hopefully this is playing a role also.  I go back in two weeks for another scan.